Carey 1993.

Study characteristics
Methods	Study design: longitudinal cohort Country: USA Data collection period: not stated Registry ID: N/A (cohort)
Participants	Number of participants: N = 308 Sample characteristics (at baseline): Age (mean): 42.0 years (SD 12.7); Sex (% male): 46% Population category: general population; Specific population: general population Nicotine dependence: Fagerström Tolerance Questionnaire (FTQ), confirmed quitters 5.5 (SD 2.1); non‐quitters 6.5 (SD 1.7); Baseline cigarettes per day: 27 (SD 11.5); 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: self‐reported 7‐day point‐prevalence abstinence (7 days prior to assessments) Cessation definition used for outcome(s) in this analysis: point‐prevalence abstinence Measure of biovalidation: saliva cotinine verified Definition of people who continued to smoke used: relapser – currently smoking but had been abstinent for at least 24 hours; person who smokes – currently smoking with no periods of abstinence exceeding 24 hours; people lost to follow‐up were assumed to be smoking Time point(s) at which follow‐up was conducted: 1, 6 and 12 months after baseline Outcome category: Stress Outcome measure(s): Perceived Stress Scale: Short Form (PSS‐4)
Funding source	American Cancer Society, National Institute on Drug Abuse
Author conflicts of interest	None specified
Notes	Outcome data source: Published data