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Cette diffusion ne suit pas une dynamique homog\u00e8ne mais s\u2019organise autour de r\u00e9seaux sociaux, de contextes festifs sp\u00e9cifiques et de temporalit\u00e9s critiques, en particulier la fin de nuit (after-parties) et les soir\u00e9es priv\u00e9es, qui semblent jouer un r\u00f4le central dans l\u2019initiation et la normalisation des usages. En s\u2019appuyant sur les concepts de l\u2019\u00e9pid\u00e9miologie et de la th\u00e9orie des r\u00e9seaux, la coca\u00efne peut \u00eatre analys\u00e9e selon une analogie \u00e9pid\u00e9miologique, o\u00f9 sa diffusion d\u00e9pend d\u2019un seuil de propagation sociale li\u00e9 aux interactions interpersonnelles et au renforcement par les pairs. Les interventions structurelles ciblant les n\u0153uds et ponts du r\u00e9seau, telles que l\u2019am\u00e9lioration des transports nocturnes\u2014susceptible de r\u00e9duire certaines transitions \u00e0 risque en fin de nuit\u2014apparaissent comme des leviers potentiels pour la pr\u00e9vention en sant\u00e9 publique.<\/jats:p>","DOI":"10.3917\/spub.262.0023","type":"journal-article","created":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T10:03:33Z","timestamp":1778839413000},"page":"23-27","source":"Crossref","is-referenced-by-count":0,"title":["Coca\u00efne\u00a0: quand le groupe fait le risque"],"prefix":"10.3917","volume":"vol. 38","author":[{"given":"Maxence","family":"Arutkin","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexandre","family":"Vall\u00e9e","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"2273","reference":[{"key":"rb1","unstructured":"1. 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