Jamrozik 1984.

Study characteristics
Methods	Design: Randomized controlled trial with 3 active trial arms Recruitment: Conducted in clinic waiting room Setting: 6 primary care practices, UK
Participants	2110 people who smoked, over the age of 16, being seen for a medical appointment, av. age not reported, av. cpd not reported
Interventions	Intervention 1: participants received verbal advice from their doctor and a self‐help booklet Intervention 2: participants received verbal advice from their doctor, a self‐help booklet and demonstration of carbon monoxide levels Intervention 3: participants received verbal advice from their doctor, a self‐help booklet and a card with information on how to contact a health visitor for further help with quitting smoking Control: no intervention
Outcomes	7‐day PPA at 12m Validation: Urinary cotinine < 100 ng/ml in a subsample of participants (Results reported are for self‐report) Quit attempts ‐ but unable to calculate data needed for analysis from paper
Funding Source	Health Education Council
Author's declarations of interest	Not reported
Notes	Strategy: CO monitoring Level: Patient Comparison type: Single component vs. standard care
Risk of bias
Bias	Authors' judgement	Support for judgement
Sequence Generation	High risk	According to day of attendance
Allocation concealment	High risk	Based on day of attendance, could have been foreseen
Blinding of outcome assessors All outcomes	Low risk	Smoking status was only validated in a subsample of participants by urinary cotinine; but contact was matched between trial arms, thereby minimizing risk of bias
Incomplete outcome data All outcomes	Unclear risk	72% returned 1‐year follow‐up questionnaire. No further details reported