Most European countries have banned flavoured cigarettes. No study has explored whether support for such a ban changes post-implementation. In the UK, a menthol cigarette ban came into force in May 2020. A longitudinal survey in the UK with adult smokers and ex-smokers explored support for the ban in 2019 (N = 3175) and 2022 (N = 3047). Support increased from 2019 (pre-ban) to 2022 (post-ban) for all participants (18.1% to 35.0%), with increased support evident for flavour cigarette smokers (20.7% to 34.5%), non-flavour cigarette smokers (13.5% to 18.1%), and ex-smokers (24.4% to 50.8%). Increased support for tobacco-related policies helps regulators defend policy decisions.