Teenagers (2) Youth (2) Tobacco (2) Logistics (2) Health (2) Consumption (Economics) (2) Fumadores (2) Salud (2) Tabaco (2) Jóvenes (2) Adolescentes (2) Logística (2) Consumo (2) régression (2) Drugs of abuse (1) Labor (1) Minors (1) Students (1) Selling (1) Schools (1) Sampling (1) Poverty (1) Nursery schools (1) Measurement (1) Families (1) Elementary schools (1) Drinking of alcoholic beverages (1) Diagnosis (1) Design (1) Combustion gases (1)