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Studies conclude that smoking behaviour spreads through social ties, and if groups of interconnected people stop smoking in concert, it encourages them to keep quitting.
Social network structure of a large quitter community
(PDF) 1.10 MB
An evaluation of the largest online community for smoking behavior change.
Social support and the transtheoretical model
A 2004 study of the relationship of social support to smoking cessation stage, decisional balance, process use, and temptation.
Relations & smoking abstinence among ever-smokers
A 2013 report from two large population-based Danish cohort studies.
The dynamics of smoking in a large social network
The dynamics of smoking in a large social network.
Evaluation of a web-based smoking cessation program
Lessons learned from a 2002 pilot study.