Bock 2014.

Study characteristics
Methods	Design: Randomized controlled trial Setting: Inner‐city hospital‐based primary care clinics, UK Recruitment: During routine healthcare visits in primary care clinics
Participants	846 adults who smoked randomized to intervention (n = 406) and control (n = 440), 68.7% female, average age 39, cpd of at least 10
Interventions	Intervention: participants received a 45‐minute counseling session with health educators and follow‐up calls at quit date and 2 weeks, in addition to the standard care (described below) Control: Healthcare professionals received training on smoking cessation guidelines and applying the 5 As Participants received brief advice from their physician and 8 weeks of NRT
Outcomes	7‐day PPA at 12m Validation: Expired CO ≤ 5 ppm
Funding Source	National Institutes of Health, National Institute on Drug Abuse (R01DA010860)
Author's declarations of interest	Authors declared that they had no conflict of interest.
Notes	Strategy: Provider training, adjunctive counseling, cost‐free medication Level: Patient, provider Comparison type: Active vs. active
Risk of bias
Bias	Authors' judgement	Support for judgement
Sequence Generation	Low risk	The computer used a random number program to assign participants at random to one of two treatment conditions
Allocation concealment	Low risk	Computerised system
Blinding of outcome assessors All outcomes	Low risk	Smoking status was validated by carbon monoxide
Incomplete outcome data All outcomes	High risk	Follow‐up rate was low overall (< 50%) : Intervention: 47.3%, Control: 41.4%