Weinhold 2017.

Study characteristics
Methods	Study design: longitudinal cohort Country: Netherlands Data collection period: 2008 ‐ 2012 Registry ID: N/A (cohort)
Participants	Number of participants: N = 5227; Number included in meta‐analysis: N = 1782 Sample characteristics (at baseline): Age (mean): new quit 48 years (SD 15.3), smoke now 48 years (SD 12.8); Sex (% male): new quit 51.3%, smoke now 54.9% Population category: general population; Specific population: data from the Longitudinal Internet Studies for the Social Sciences (LISS) Nicotine dependence: not measured; Baseline cigarettes per day: not measured; Motivation to quit: not selected by motivation to quit
Interventions	Behavioural support for smoking cessation: no behavioural support Pharmacological support for smoking cessation: no pharmacological support Psychotherapeutic or psychoactive support for mental health or mood: did not receive mood management
Outcomes	Definition of cessation used: the Health module of the LISS asks respondents ‘Have you ever smoked?’ and ‘Do you smoke now?’; ‘smokers who quit during survey’ are respondents who changed status from smoking in the first observation to not smoking in the last observation Cessation definition used for outcome(s) in this analysis: unclear point prevalence Measure of biovalidation: not bioverified Definition of people who continued to smoke used: those who reported smoking in the first and last observation Time point(s) at which follow‐up was conducted: 5 years Outcome category: Positive Affect Outcome measure(s): Subjective Wellbeing – SWB – 1; measures “happiness” in “the respondent’s personal life”
Funding source	None specified
Author conflicts of interest	None declared
Notes	Outcome data source: Published and unpublished data