The purpose of this project is to understand how different types of non-cigarette tobacco products affect the way smokers use tobacco products. Participants will complete three in-person visits. During the second visit, participants will sample a traditional cigarette and two e-cigarette e-liquids. Participants will answer questionnaires about each product they sample and then complete a preference assessment in which they choose between the products they sampled and their own cigarette. Finally, participants will take home a tobacco product they sampled to use ad libitum (1-week sampling). During the at-home baseline and sampling weeks, participants will complete electronic daily diaries cataloging their tobacco use. Biomarkers (i.e., expired carbon monoxide, cotinine) will corroborate self-reported indices of use. Participation will last approximately two weeks. E-cigarettes are likely less harmful than combustible cigarettes, but we are unsure how harmful, or how safe they might be. Side effects from using the e-cigarette are generally rare and mild, and may include: nausea, headache, heartburn, irritability, anxiety, headache, or trouble sleeping. There is no direct benefit for participating. Participation will aid researchers to determine how different types of tobacco products affect smoking behavior.

The goal of this research is to understand how different types of e-cigarettes affect tobacco use. Participants will either be assigned to a control group that does not receive an e-cigarette or be assigned to receive one of two different types of e-cigarettes to sample in the lab and at home. We will measure participants' smoking and smoke exposure during the study.

The purpose of this project is to understand how different e-cigarettes influence their likeability and use among current smokers who try using e-cigarettes. Participants will receive an e-cigarette to sample over a three week period. During this time period they will complete daily electronic diaries and weekly lab visits. The results from this information will help us understand how different types of e-cigarettes are likely to influence cigarette and e-cigarette use.