Acknowledgements
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This study was supported by the Swiss National Science Foundation, grant 32 003-179 369, CHF 194942 (EUR 182200, USD 200700). J.F.E.’s salary is paid by the University of Geneva; Y.K.’s salary is paid by the Lausanne University Hospitals G.V.C’s salary is paid by the University of Picardie. Vincent Baujard developed the software for data collection and managed and maintained the on-line data collection system. Evelyne Laszlo supervised the development of both versions of the application (Stop-tabac and control) and moderated the discussion forum ‘The Tribe’.