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Identifying specific aspects of peer social norms that influence adolescent substance use may assist international prevention efforts. This study examines two aggregated measures of social norms in the school setting and their predictive association with substance (alcohol, tobacco and marijuana) use 2 years later in a large crossnational population-based cohort of adolescents. The primary hypothesis is that in Grade 7 both ‘‘injunctive’’ school norms (where students associate substance use with ‘‘coolness’’) and ‘‘descriptive’’ norms (where student substance use is common) will predict Grade 9 substance use. Data come from the International Youth Development Study, including 2,248 students (51.2 % female) in the US and Australia attending 121 schools in Grade 7.

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Journal Article

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