This trial will evaluate the impact of combining zonisamide and bupropion on the process of switching from CCs to an e-cigarette. There will be a data collection period of at least five days to obtain baseline information on the use of CCs. All participants enrolled in the study will receive a JUUL e-cigarette at Visit 2 for ad libitum use. After the first week of e-cigarette use (at Visit 3), participants will be given bupropion (150 mg each morning for days 1-3, then 300 mg daily) with either zonisamide (100 mg daily) or placebo (group 1 and