Abstract
In an attempt to identify prognostic factors, non-drug users and abusers in the Gothenburg [Sweden] year cohort of 1953 were compared with reference to background data. Individuals with chronic abuse differed most from the "normal" group. Prognostic factors for drug abuse were: member of a multiproblem family, child psychiatric care, contact with the Social Welfare Administration at an early age, truancy, placement in special class, premature drop-out from school, admitted high-frequency drug use in a school questionnaire, for boys early registration for crimes and for girls nervous complaints. Results indicate the necessity of earlier and more effective prevention.

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