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Two groups of Ss, one heroin knowledgeable and one heroin naive, were administered tests of personality and degree of contact with the drug culture. It was predicted that: (1) drug use is related to association with other users, (2) personality measures would distinguish heroin from non-heroin users, and (3) heroin-knowledgeable Ss would be more impulsive in their judgments than heroin-naive Ss.
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Weissbach et al. (1973) studied this question.
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