During the study visits, measures will be taken before and after participants smoke their own usual brand cigarette one continuously. Participants will be randomly assigned to continuous smoking or relight smoking conditions. Participants randomized to the continuous smoking condition will crossover to the relight smoking condition after 60 minutes on their first visit.

Visits will be separated by 7-10 days, to ensure there are 2 weekdays and 1 weekend day falling in that period for cigarette butt collection.

On the second visit, participants will begin with the second smoking condition they were assigned on their first visit. They will crossover to the remaining condition after 60 minutes. Participants initially assigned to the continuous smoking condition will begin their second visit with the relighting smoking condition and cross over to the continuous smoking condition after the 60 minutes.

During the study visits, measures will be taken before and after participants smoke their own usual brand cigarette one continuously. Participants will be randomly assigned to continuous smoking or relight smoking conditions. Participants randomized to the relight smoking condition will crossover to the continuous smoking condition after 60 minutes on their first visit.

Visits will be separated by 7-10 days, to ensure there are 2 weekdays and 1 weekend day falling in that period for cigarette butt collection.

On the second visit, participants will begin with the second smoking condition they were assigned on their first visit. They will crossover to the remaining condition after 60 minutes. Participants initially assigned to the relighting smoking condition will begin their second visit with the continuous smoking condition and cross over to the relighting smoking condition after the 60 minutes.

Participants will smoke their own usual brand cigarettes. Cigarette butts will be collected.

Level of nicotine in cigarette butts collected during study.

In-clinic measurement of puff volume using topography device.