Blood alcohol concentration (BAC) level was determined 6 times over 6 hours to assess for changes in BAC from use of an e-cigarette containing ethanol compared to the use of an e-cigarette without ethanol.

Blood Alcohol Concentration (% alcohol)

Breath Alcohol Concentration (BrAC) was assessed 12 times over 6 hours to determine changes in BrAC from the use of an e-cigarette containing ethanol compared to the use of an e-cigarette without ethanol.

Blood Alcohol Concentration (% alcohol)

Oral fluid alcohol concentration (OFAC) was assessed 9 times over 6 hours to determine changes in OFAC from the use of an e-cigarette containing ethanol compared to use of an e-cigarette without ethanol.

Blood Alcohol Concentration (% alcohol)

5-Hydroxytryptophol was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarker (5-Hydroxytryptophol) ng/mL

5-Hydroxyindoleacetic acid was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (5-Hydroxyindoleacetic Acid) ng/mL

Ethyl sulfate was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Ethyl Sulfate) ng/mL

Phosphatidylethanol 16:0-18:1 was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Phosphatidylethanol 16:0-18:1) in Blood ng/mL

Phosphatidylethanol 16:0-18:2 was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Phosphatidylethanol 16:0-18:2) in Blood ng/mL

5-Hydroxytryptophol glucuronide was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (5-Hydroxytryptophol Glucuronide) in Blood ng/mL

Ethyl glucuronide was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Ethyl Glucuronide ) in Blood ng/mL

5-Hydroxyindoleacetic acid was analyzed in oral fluid 9 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (5-Hydroxytryptophol) in Oral Fluid ng/mL

5-Hydroxyindoleacetic acid was analyzed in oral fluid 9 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (5-Hydroxyindoleacetic Acid) in Oral Fluid ng/mL

Ethyl sulfate was analyzed in oral fluid 9 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Ethyl Sulfate) in Oral Fluid ng/mL

Phosphatidylethanol 16:0-18:1 was analyzed in oral fluid 9 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Phosphatidylethanol 16:0-18:1) in Oral Fluid ng/mL

Phosphatidylethanol 16:0-18:2 was analyzed in oral fluid 9 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Phosphatidylethanol 16:0-18:2) in Oral Fluid ng/mL

Ethyl glucuronide was analyzed in blood 6 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (5-Hydroxytryptophol Glucuronide) ng/mL

Ethyl glucuronide was analyzed in oral fluid 9 times over a course of 6 hours to assess changes in determined concentrations from use of an electronic cigarette containing ethanol.

Ethanol Biomarkers (Ethyl Glucuronide) in Oral Fluid ng/mL

Standard Field Sobriety Tests (SFSTs) were administered 4 times over a course of 6 hours to assess changes in objective impairment. The SFST includes the Horizontal Gaze Nystagmus (a jerking or stuttering type of movement observed in a person's eyes that occurs as a result of consuming alcohol or other nervous system depressants) test. For each test, a law enforcement officer records the number of clues observed. HGN has a maximum of 6 clues, 3 per eye:

1. lack of smooth pursuit
2. distinct and sustained nystagmus at maximum deviation
3. onset of nystagmus prior to 45 degrees.

Horizontal Gaze Nystagmus # of clues observed

Standard Field Sobriety Tests (SFSTs) were administered 4 times over a course of 6 hours to assess changes in objective impairment. The SFST includes the walk and turn test (suspect to perform a physical task while simultaneously following instructions and maintaining balance; involves walking a straight line heel-to-toe, turning, and walking back, with officers looking for specific indicators of impairment). For each test, a law enforcement officer records the number of clues observed. WAT has a maximum of 8 clues:

1. inability to balance during the instruction phase
2. starting before the officer has finished the instructions
3. Stopping while walking to regain balance
4. Not touching heel-to-toe
5. Stepping off the line
6. Using arms to balance
7. Losing balance on the turn or turning incorrectly
8. Taking the wrong number of steps

Walk and Turn Test, # of clues observed

Standard Field Sobriety Tests (SFSTs) were administered 4 times over a course of 6 hours to assess changes in objective impairment. The SFST includes the one-leg stand test (assess balance and coordination, potentially indicating impairment due to alcohol or drugs). For each test, a law enforcement officer records the number of clues observed. OLS has a maximum of 4 clues: Swaying while balancing, Using arms for balance, Hopping 4. Putting the raised foot down

One leg stand test, # of clues observed

Subjective High Assessment Scale Questionnaire (SHAS) is a 14-item questionnaire used to assess how intoxicated a person feels after consuming alcohol, typically administered in laboratory settings. It focuses on capturing subjective sensations associated with intoxication, such as feeling "clumsy," "dizzy," or "high". Participants rate their experience on a visual analog scale (a line with markings) to indicate the extent to which they feel each symptom at a given time. The scale ranges from Normal" (0) to "Extremely" (100). The score for each of the questions is summed to give an overall indication of the individual's subjective intoxication. A higher score would indicate greater feelings of impairment.

Subjective High Assessment Scale Questionnaire (SHAS) Total score

Biphasic Alcohol Effects Scale Questionnaire (BAES) is a 14-item questionnaire consisting of adjectives that describe the stimulant- and sedative-like effects of alcohol. The items are presented in alphabetical order, and are rated on an 11-point rating scale from 0=Not at All to 10=Extremely. The score for each of the questions was summed to give an overall indication of the individual's subjective intoxication. A higher score would indicate greater feelings of impairment.

Biphasic Alcohol Effects Scale Questionnaire (BAES) total score

The general labeled magnitude scale (gLMS) is a psychophysical scaling method used to measure the perceived intensity of various sensations. A gLMS typically ranges from 0 (undetectable) to 100 (strongest imaginable sensation/experience of any kind). Crucially, it uses specific labels positioned at specific points on the scale (e.g., barely detectable, weak, moderate, strong, very strong). The gLMS was comprised of 3 questions asking participants to indicate the overall flavor sensation, harshness, and throat hit of the e-cigarette. The score for each of the questions was summed. A higher score would indicate greater sensations from e-cigarette use.

General Labeled Magnitude Scale Questionnaire (gLMS) total score

A survey tool used to measure how much someone likes or dislikes something using descriptive labels for different levels of liking and disliking. Instead of just numbers, the scale uses words or phrases that describe the intensity of liking or disliking (e.g., "most disliked sensation imaginable"=0, "neutral" = 50, and "most liked sensation imaginable"=100) and aim to provide ratio-level data, meaning that the differences between scale points are meaningful and proportional. the LHS was comprised of 4 questions asking participants to indicate the e-cigarette's overall flavor sensation, harshness, throat hit, and warmth of the vapor. The score for each of the questions was summed. A higher score would indicate a more liked overall vaping experience; a lower score would indicate a more disliked overall vaping experience

Labeled Hedonic Scale Questionnaire (LHS) total score

Direct Effects of Vaping Questionnaire (DEVQ) is a 10-item Questionnaire that asks participants about their vaping experience (10 questions, each scored from 0 - 100). While subscale scores are often the primary focus, an overall score may be calculated by summing all item scores or averaging them. The score for each of the questions was summed. A higher score indicates the e-cigarette evoked greater subjective effects or feelings.

Direct Effects of Vaping Questionnaire (DEPVQ) total score