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Standalone social influence–based interventions to reduce cannabis use
Summary of the evidence
School programmes based on social competence approaches were found in a systematic review (Faggiano et al., 2014) to be more effective than usual curricula in:
- reducing use of cannabis at <12 months follow-up (RR 0.88, 95 % CI 0.72 to 1.07, 3 studies, N=10 716);
- reducing use of cannabis at 12+ months follow-up (RR 0.95, 95 % CI 0.81 to1.13, 1 study, N=5 862)
- reducing use of hard drugs (just one study not providing data for meta-analysis found a significant protective effect)
