Cannabis (2) Use (2) tabac (1) temps (durée) (1) établissement scolaire (1) risque (1) association (1) exposition (1) alcool (1) consommation (1) âge (1) vecteur (1) Teenagers (1) Violence (1) Tobacco (1) Time (1) Symptoms (1) Suicide (1) Social groups (1) Sex crimes (1) Risk (1) Poor (1) Middle schools (1) Mental health (1) Life (1) Grade repetition (1) Generations (1) Education (1) Drugs (1) Alcohol (1)