Davis 2014b.

Study characteristics
Methods	Study design: RCT Location: USA Setting: community Recruitment: advertisements placed on television, newspaper, and flyers (targeted in low‐SES areas) Study dates: 2011‐12
Participants	N = 135 Specialist population?: people living in low‐SES areas Definition of smoker used: ≥ 5 cpd, uses no other tobacco products Participant characteristics: 47% female; average age: 45 years; 88% white; 35% high school education or less; average cpd: 18; nicotine dependence: average FTND 4.8
Interventions	Comparator: American Lung Association's Freedom from Smoking (FFS) programme, enhanced to match the Mindfulness Training for Smokers (MTS) intervention more closely (FFS‐E) Mode of delivery: face‐to‐face (group), video, audio recording Intensity: 24 h over 7 weeks Pharmacotherapy: 2 weeks of nicotine patches from quit date Type of therapist/provider: master's degree in psychology, no specialised training or certification in addiction therapy (FFS instructors are typically laypeople), provided with a 2‐day FFS‐E teacher‐training course BCTs: 1.1 Goal setting (behaviour): set a quit plan, 11.1 Pharmacological support, 12.6 Body changes Intervention: Mindfulness Training for Smokers (MTS) Mode of delivery: face‐to‐face (group), video, audio recording Intensity: 7 classes (x 2.5 h) and a quit day retreat (6.5 h) over 7 weeks (total 24 h) Pharmacotherapy: 2 weeks of nicotine patches from quit date Type of therapist/provider: master's degree in psychology (except for one who had a PhD in Sociology), no specialised training or certification in addiction therapy, provided with a 2‐day MTS teacher‐training course BCTs: 1.2 Problem solving, 3.1 Social support (unspecified), 4.1 Instruction on how to perform behaviour, 11.1 Pharmacological support, 11.2 Reducing negative emotions, 12.6 Body changes
Outcomes	Definition of abstinence: 7‐day point prevalence Longest follow‐up: 6 months Biochemical verification: CO < 7 ppm Other relevant outcomes reported: stress
Notes	Relevant comparisons: mindfulness training + NRT vs Freedom From Smoking programme + NRT Funding source: National Institute on Drug Abuse (K23 DA022471) Author conflicts of interest: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Method not reported
Allocation concealment (selection bias)	Unclear risk	Concealment not reported
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Abstinence biochemically verified
Incomplete outcome data (attrition bias) All outcomes	High risk	Attrition was high in both groups: 57.4% (39/68) in the intervention group and 55.2% (37/67) in the control group
Selective reporting (reporting bias)	Low risk	Prespecified outcomes reported