This is a research study to examine if and how patterns of use change over time among three different groups of tobacco users: 1) adults who exclusively smoke combustible cigarettes, 2) adults who exclusive use e-cigarettes, and 3) adults who use both. This is a naturalistic survey study, there is nothing required or requested of participants, other than to complete our surveys. Participants do not need to quit or reduce their smoking/e-cigarette use if they do not want to. They do not need to travel for this study; it is completely remote and they can participate from your home.
Participation in the study will take place over a period of 12 months in the form of: 1) Monthly Surveys (13 total), 2) Daily Diaries for the first 90 days, 3) Follow-Up Diaries in each of the 7 days leading up to each monthly follow-up survey, and 4) Submission of Breath Samples (13 total).