This study is recruiting youth between the ages of 12 and 21 who use electronic cigarettes (e-cigs, vaping) and are interested in quitting. The purpose of this research study is to explore if youth vapers can quit using a smartphone application that delivers incentives. This study is completely remote (no in-person visits) with phone call visits and the use of a mobile app. If enrolled, participants will have brief weekly phone call visits for 4 weeks and a follow-up call on week 8. Participants will be encouraged to quit vaping during the study. Participants will be asked to submit selfie videos via the app providing saliva cotinine (by product of nicotine) samples to confirm that they have quit vaping.

The purpose of this study is to better understand tobacco outcomes using a well-known stop smoking medication, varenicline (Chantix), and financial incentives with tobacco users. We are also interested in how cannabis/marijuana and tobacco interact during a tobacco quit attempt. All participants will receive tobacco cessation treatment (varenicline) for 12 weeks. This study will recruit adult tobacco users (ages 18-40) who are motivated to quit smoking cigarettes.