Sanchez‐Villegas 2008.

Study characteristics
Methods	Study design: longitudinal cohort Country: Spain Data collection period: the SUN project started December 1999 with participants followed up every 2 years Registry ID: N/A (cohort)
Participants	Number of participants: N = 8556 Sample characteristics (at baseline): Age (mean): information not available; Sex (% male): information not available Population category: general population; Specific population: general population Nicotine dependence: information not available; Baseline cigarettes per day: information not available; 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: some participants were using antidepressants at follow‐ups, i.e. received mood management
Outcomes	Definition of cessation used: continuous abstinence ‐ ‘ex‐smokers who had quit smoking more than 10 years ago’ Cessation definition used for outcome(s) in this analysis: continuous abstinence Measure of biovalidation: not bioverified Definition of people who continued to smoke used: ‘smokers’ Time point(s) at which follow‐up was conducted: baseline and at 2‐, 4‐, 6‐year follow‐ups after baseline; mean follow‐up period was 47.4 months Outcome category: Depression Outcome measure(s): presence of self‐reported physician diagnosis or use of antidepressant medication, or both
Funding source	The SUN Project has received funding from the Spanish Government (current Grants PI10/02658, PI10/02293, PI13/00615, PI14/01798, RD06/0045, G03/140 and 87/2010), the Navarra Regional Government (45/2011, 27/2011) and the University of Navarra
Author conflicts of interest	None specified
Notes	Outcome data source: Published data