Adolescent drug use, psychological distress, and physical symptoms.

The longitudinal interrelationships among general drug use, psychological distress, and physical symptoms were investigated in a three wave panel study of a community sample of adolescents interviewed when they were 12, 15, and 18 years of age. Results did not provide any support for the hypothesis that adolescents use drugs in general to cope with pre-existing psychological distress and physical symptoms. In contrast, the results supported the hypothesis that general drug use contributes to physical and psychological impairments over time. However, such drug-induced psychological distress and physical symptoms only occurred in later adolescence (from ages 15 to 18), and no evidence of impairments due to general drug use or specific alcohol use was found in early adolescence (from ages 12 to 15). Psychological distress and physical symptoms influenced each other over time, and physical symptoms partially mediated longitudinal changes in psychological distress. However, general drug use did not mediate any longitudinal changes in psychological distress and physical symptoms.