Drugs of abuse (1) Labor (1) Origin (1) Tobacco (1) Students (1) Research (1) Population (1) Migration, Internal (1) Marijuana (1) Health (1) Hallucinogenic drugs (1) Emigration and immigration (1) Education, Higher (1) Drug abuse (1) Desertion, Military (1) Consumption (Economics) (1) College students (1) Alcohol (1) Drogas--Consumo (1) Origen (1) Estudios (1) Salud (1) Alcohol (1) Marihuana (1) Estudio (1) Alucinógenos (1) Estudiantes (1) Tabaco (1) Emigración e inmigración (1) Población (1)