The primary outcome was self-reported 7-day point prevalenceabstinence (biochemically confirmed with exhaled CO level≤5 ppm) at 52 weeks after the target quit day19 collected byblinded research staff. Secondary abstinence outcomes includedself-reported 7-day point prevalence abstinence (biochemicallyconfirmedwith exhaledCO level) at 23weeks after the target quitday and prolonged abstinence defined as no smoking from day7 to day 160 and from day 7 to day 352 after the target quit day