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\bibitem{Spilka_etal2012} Spilka, S., Le N{\'e}zet, O., Beck, F., Ehlinger, V., \& Godeau, E. (2012). \textit{Tendances no. 80 : Alcool, tabac et cannabis durant les {\textquotedblleft}ann{\'e}es coll{\`e}ge{\textquotedblright}}. Saint-Denis-La Plaine: Observatoire fran{\c c}ais des drogues et des toxicomanies (OFDT).

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