Addiction
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Randomized Controlled Trial
Efficacy of a smoking prevention programme in Catalan secondary schools: a cluster-randomized controlled trial in Spain.
To evaluate the efficacy of a school-based educational programme in reducing the incidence and prevalence of smoking in secondary school students (compulsory secondary education: CSE) in Catalonia (Spain). ⋯ A school-based educational intervention for secondary school students in Catalonia, Spain was not found to lead to a statistically significant reduction of smoking prevalence and incidence.