"Why do people abuse drugs",. Peer pressure, curiosity, ignorance, alienation, changing social structure, urbanization and unemployment. Theories related to drug abuse: BIOLOGICAL THEORIES: genetic theory, endocrine theory and allergy related; PSYCHOLOGICAL THEORIES: psychoanalytic theory, learning theory & personality trait theory; SOCIOLOGICAL THEORIES; CULTURAL THEORIES; DEVIANT BEHAVIOUR THEORY. Classification of drugs according to their effects: 1narcotic analgesics, 2stimulants, 3depressants 4hallucinogens. Classification of drugs according to origin 1natural drugs 2semi synthetic drugs 3synthetic drugs 4designer drugs. "Stages of alcoholism" 1early-stage 2middle stage 3chronic stage. Drug deception a) dilution b)adulteration C) substitution. `Target groups` •Street children •workers •sports personnel •artist •persons engaged in routine and monotonous work