[...] Zero is a telemedicine-based product: Users get a personalized quitting regimen from a doctor via online visit, then the company ships them a $129-per-month “Quit Kit” containing bupropion (a medication to curb cravings) and nicotine gum. They’re also encouraged to use Zero’s app, which helps them track their progress in terms cumulative days without smoking as well as consecutive days off, and talk to their assigned physician at any time.