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By studying what happens between the initial experience of drugs and the subsequent sharing of drugs with others, it is possible to see that much (though not all) of the person-to-person spread of drugs takes place within a year or so of starting drug use. Drug-dependent people seem to be less likely to introduce others to drugs, perhaps because they are concerned about their own supply. There is considerable appreciation for the evidence on co-occurrence of drug dependence with other psychiatric disturbances, especially antisocial personality disorder but also anxiety and affective syndromes. The diagnostic criteria are just points of departure for a more public-health-oriented model of needs assessment. The increased risk of other psychiatric syndromes among pre-dependent drug users reinforces the argument for earlier rather than later clinical attention being given to these drug users.
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