The goal of this cluster randomized controlled trial is to learn if the set up of an advocacy coalition in secondary schools can improve the implementation of tobacco-free school policies (TFSP) to prevent adolescent smoking. The main questions it aims to answer are: 1. To what extent is an advocacy coalition related to smoking prevention implementable in school's routine ? 2. Is an advocacy coalition an effective way to prevent smoking among adolescents and shift smoking norms in school? Schools in the intervention arm will be compared to schools in the control arm, to test the effectiness of the advocacy coalition to improve the implementation of TFSP. Schools in the intervention arm will put in place an advocacy coalition, that is * Set up a task force composed of school stakeholders (students, teachers, educators, principle,...) * Share their good practices regarding implementation with the other schools of the intervention arm * Be supported to reffer nicotine-dependant students and staff members to smoking cessation programs Continuous evaluation is planned to assess the effectiveness of this intervention.
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Smoking prevalence
Timeframe: 2 years