Ferguson 2015.

Methods	Study design: RCT Country: Australia Recruitment: advertisements in papers, radio, social media, Facebook, in Tasmania Study dates: not stated
Participants	Baseline characteristics (n = 284) Mean age: 42.1 (SD 13.2) Female: 51.1% (N = 145) Household income < AUD 45,000: 66.7% (N = 189) FTND: mean 4.8 (SD 2.0) White: 93.7% (N = 266) Inclusion criteria: daily smokers of > 10 cigarettes/day for past 3 years Exclusion criteria: not explicitly stated
Interventions	Control: self‐help quit booklet containing tips for quitting and cognitive and behavioural coping mechanisms Intervention: as above, plus 4 or 5 randomly timed text messages/day containing quit smoking advice and encouragement tailored to participants' current quit status (preparing to quit, first week of the quit attempt, second week of attempt etc.). Participants could request additional text messages
Outcomes	Definition of abstinence: 7‐day point prevalence abstinence verified by expired CO at 6 months
Funding source	National Health and Medical Research Council
Conflicts of interest	SF has consulted for GlaxoSmithKline Consumer Healthcare on matters relating to SC and has received researcher‐initiated project grant funding from Pfizer (through the GRAND initiative)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomisation schedules for sequential allocation. No further information provided
Allocation concealment (selection bias)	Unclear risk	Quote: "The group allocation procedure was designed to blind study staff with direct participant contact from knowing group assignment"
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Abstinence was biochemically verified
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Loss to follow‐up not stated