NCT00534404.

Methods	Setting: USA Recruitment: Quote: "Interested individuals completed a screening survey to determine eligibility. Following study consent, participants completed two emailed surveys over the next two days and a phone confirmation call before being randomized. These check‐ins confirmed the participant had valid contact information and maintained their desire to quit smoking."
Participants	2485 adult smokers of ≥ 10 cigs/day, willing to set a quit date within 2 to 4 weeks, willing to use a nicotine patch, 31% M, av. age 44.
Interventions	1. NRT patch (free 8‐week) + Internet (iQuit Smoking website) 2. As 1, plus 5 sessions of TC after 0, 2, 4, 6 and 8 weeks
Outcomes	Self‐reported abstinence at 9 m (6 m prolonged) Validation: none
Notes	New for 2018 update Funding: not reported Declarations of interest: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information provided on ClinicalTrials.gov website
Allocation concealment (selection bias)	Unclear risk	Insufficient information provided on ClinicalTrials.gov website
Blinding of outcome assessment (detection bias) All outcomes	High risk	Abstinence not biochemically validated. Level of personal contact differed between arms
Incomplete outcome data (attrition bias) All outcomes	Low risk	Low percentage (19%) of participants lost to follow‐up and comparable across arms