last year. Of those who had made a serious quit attempt, respondents were also asked: time since start of the most recent quit attempt (last week [ref]/between a week and a month/1-2 months/2-3 months/3-6 months/6-12 months); abrupt versus gradual [ref] quit attempt at most recent attempt; use of evidence-based aids in the most recent quit attempt (e.g. use of e-cigarettes,24 nicotine replacement therapies, behavioural support: yes/no [ref]); receipt of GP advice and/or support (yes/no [ref]). Among past-year smokers who had made a serious quit attempt in past 12 months, quit success (having quit smoking completely in the past 12 months) was measured (successful/unsuccessful [ref]). Among current smokers, motivation to quit smoking was measured using the Motivation to Stop Scale,25 a continuous score from 1 (‘do not want to stop smoking’) to 7 (‘really want to stop smoking and intend to in the next month’). Full details of the measures included are available in Supplementary File 1.
