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Prevalence of substance use in relation to socio-economic trajectory groups (TEMPO study, France, n = 1103, 2009, age range: 22–35 years). Smoking: ≥1 cigarette per day for the last 12 months. Cannabis use: smoking cannabis on ≥ 1 occasion; problematic cannabis use: a score of ≥2 on the CAST (range 0–6)
