Swiss (4) Drugs (4) Substance use (4) Risk factors (4) cohorte (4) jeune (3) Methods (3) Men (3) Cannabis (3) Methods (3) Utilization (3) étable (2) risque (2) recherche (2) alcool (2) Drug use (2) Ketamine (2) States (2) Risk (2) Research (2) Months (2) Heroin (2) Hallucinogenic plants (2) Hallucinogenic drugs (2) Example (2) Ecstasy (2) Drug utilization (2) Drug abuse (2) Cocaine (2) Chemicals (2)