This study assessed aggression and locus of control in 20 drug users, 20 addicts and 20 control subjects. The Rotter Locus of Control Scale and the Questionnaire for Measuring Spontaneous Aggression were administered to 60 men. In comparison with drug users and controls, the addicts obtained higher scores on External Locus of Control and Spontaneous Aggression, so addicts and drug users must be considered two distinct groups. Nevertheless, no statistically significant correlation between scores on these measures was found.
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