Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated mixed-effects ordinal regression models that accounted for repeated measures at both the day- and individual-levels.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H2 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received pictorial warnings (pictorial warning only AND insert + pictorial warnings) with the groups that did not (insert only AND control). We expected that the outcome would be higher in the pictorial warning groups than in the no pictorial warning groups.

We estimated mixed-effects ordinal regression models that accounted for repeated measures at both the day- and individual-levels.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H2 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received pictorial warnings (pictorial warning only AND insert + pictorial warnings) with the groups that did not (insert only AND control). We expected that the outcome would be higher in the pictorial warning groups than in the no pictorial warning groups.

We estimated mixed-effects ordinal regression models that accounted for repeated measures at both the day- and individual-levels.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated mixed-effects ordinal regression models that accounted for repeated measures at both the day- and individual-levels.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated mixed-effects logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated mixed-effects logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated mixed-effects ordinal regression models that accounted for repeated measures at both the day- and individual-levels.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H2 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received pictorial warnings (pictorial warning only AND insert + pictorial warnings) with the groups that did not (insert only AND control). We expected that the outcome would be higher in the pictorial warning groups than in the no pictorial warning groups.

We estimated mixed-effects ordered logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H2 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received pictorial warnings (pictorial warning only AND insert + pictorial warnings) with the groups that did not (insert only AND control). We expected that the outcome would be higher in the pictorial warning groups than in the no pictorial warning groups.

We estimated mixed-effects ordered logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated mixed-effects ordered logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated mixed-effects ordered logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H2 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received pictorial warnings (pictorial warning only AND insert + pictorial warnings) with the groups that did not (insert only AND control). We expected that the outcome would be higher in the pictorial warning groups than in the no pictorial warning groups.

We estimated mixed-effects ordered logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be lower in the insert groups than in the no insert groups.

We estimated mixed-effects logistic regression models that accounted for repeated measures at the individual level.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H2 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received pictorial warnings (pictorial warning only AND insert + pictorial warnings) with the groups that did not (insert only AND control). We expected that the outcome would be higher in the pictorial warning groups than in the no pictorial warning groups.

We estimated mixed-effects ordinal regression models that accounted for repeated measures at both the day- and individual-levels.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with the only alteration being the small health warning message on the side of the pack, whose textual content will be the same as that used for the pictorial warning label conditions.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four different rotating messages to promote response efficacy beliefs (2 inserts on the benefits of cessation) or self-efficacy to quit (2 inserts with cessation tips).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include four different rotating pictorial warnings showing the consequences of smoking and that cover 50% of the front and back of the pack.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

Participants will be provided with a 2 week supply of their preferred brand of cigarettes, with packs altered to include inserts with four rotating efficacy messages (see description above) and four rotating pictorial warnings (see above).

Inserts with efficacy messages: Four rotating inserts (i.e., small, printed messages) with messages about cessation benefits (i.e., response efficacy) and tips to quit (i.e., self-efficacy messages) will be placed inside cigarette packs.

Pictorial warnings on packs: Four rotating pictorial warnings illustrating the harms of smoking will be printed on labels that will placed on and cover approximately 50% of the cigarette packs.

These results are for the pre-specified H1 assessment (see Statistical Analysis Plan, Model 1), comparing groups that received inserts (insert only AND insert + pictorial warnings) with the groups that did not (pictorial warning only AND control). We expected that the outcome would be higher in the insert groups than in the no insert groups.

We estimated negative binomial regression models, as there is a single measure for each person and so there are no repeated measures.

The reported p-value is not adjusted. The a priori threshold for statistical significance uses a Bonferroni-adjusted critical value of p<0.05/6=0.0083