This is a smoking cessation study which is examining varenicline for use in reducing or quitting e-cigarettes. Half of the participants will receive a placebo pill and half will receive varenicline. All participants will be asked to complete daily, brief REDCap EMA diaries (to report e-cigarette use, other tobacco use, and record videos of medication taking) and attend research visits every 3 weeks (i.e., weeks 3, 6, 9, 12) to complete additional assessments and receive compensation for doing so.

This is a smoking cessation treatment study. Patients who have a cancer or a suspected cancer who will undergo surgical removal of their cancer are eligible to participate in this study. A novel smoking cessation treatment will be provided to half of the participants in the study. All study participants will receive standard smoking cessation therapy including counseling and the nicotine patch.