Exactly two years after a large survey of substance use among secondary school adolescents in London in 1987 (Swadi, 1988), a similar survey among a sub-sample using the same questionnaire was carried out. Of 242 second- and third-year pupils from one of the six schools in the original sample, 219 were available for the follow-up. In 1989 they were in the fourth and fifth years; the sexes were equally represented. The follow-up survey aimed to investigate the trends with respect to the prevalence of use of various drugs and to investigate the effect of the absence of a specific drug-prevention programme on such trends. Comparisons are also made with survey results from the fourth and fifth year at the same school in 1987.
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