Drugs of abuse (2) Psychology (2) Methodology (2) Drug abuse (2) Consumption (Economics) (2) Drogas--Consumo (2) Drogas (2) Metodología (2) Psicología (2) Consumo (2) Youth and violence (1) School enrollment (1) Youth (1) Worry (1) Women (1) Tobacco (1) Suicide (1) Social status (1) School children (1) Research (1) Parents (1) Marijuana (1) Good and evil (1) Ecstasy (1) Design (1) College students (1) College graduates (1) Cocaine (1) Alcohol (1) Estudiantes matriculados (1)