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Yamaguchi, Kazuo; Kandel, Denise B. – American Journal of Public Health, 1984
A cohort of former New York State adolescents were reinterviewed nine years after an initial survey. Drug use predictions, it was found, can be based on age effects and prior types of drug use; marijuana use, for example, is necessary for progression to other illicit drugs. (KH)
Descriptors: Adolescents, Age Differences, Cohort Analysis, Developmental Stages