NCT03253445.

Study name	Individual acceptance and commitment therapy (ACT) for smoking cessation for schizophrenic patients
Methods	Study design: RCT Location: Hong Kong Setting: not reported Recruitment: not reported Study dates: 2014‐18 (estimated)
Participants	N = 160 (target) Specialist population?: diagnosed schizophrenia Definition of smoker used: ≥ 1 cpd
Interventions	All participants are given a brief educational talk on encouraging quitting smoking (about 5 min) and a self‐help leaflet on smoking cessation Comparator: ACT + brief advice + self‐help materials Mode of delivery: face‐to‐face, written materials Intensity: 10 sessions (x 20‐30 min) Pharmacotherapy: none Type of therapist/provider: n/a BCTs: 1.9 Commitment, 4.1 Instruction on how to perform the behaviour Intervention: social support + brief advice + self‐help materials Mode of delivery: face‐to‐face, written materials Intensity: 10 sessions (x 5 min) Pharmacotherapy: none Type of therapist/provider: n/a BCTs: 3.1 Social support (unspecified), 4.1 Instruction on how to perform the behaviour
Outcomes	Definition of abstinence: 7‐day point prevalence Longest follow‐up: 6 months Biochemical verification: CO (threshold not reported), urinary cotinine (threshold not reported) Other relevant outcomes: none
Starting date	2014
Contact information	Dr. Yim Wah Mak, Assistant Professor, The Hong Kong Polytechnic University
Notes	Contacted PI for update: no response Funding source: not reported Author conflicts of interest: not reported

ACT: acceptance and commitment therapy; BCT: behaviour change techniques; CBT: cognitive behavioural therapy; cpd: cigarettes per day; n/a: not applicable; NRT: nicotine replacement therapy; PI: principal investigator; RCT: randomised controlled trial