étable (2) Teenagers (2) Young adults (2) Week (2) Manufacturers' agents (2) High schools (2) Commission merchants (2) Change (2) jeunesse (1) risque (1) politique (1) alcool (1) éducation (1) âge (1) Education (1) Epidemiology (1) Longitudinal studies (1) Methods (1) Scores (1) Longitudinal studies (1) Canna (1) Youth (1) Walking (1) Time (1) Tallies (1) Strategy (1) Sex (1) Risk (1) Questionnaires (1) Proportion (1)