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A self-report inventory of addictions and emotional problems, the Problem History Questionnaire (PHQ), was administered to 604 college students as part of a larger study of the correlates of multiple patterns of addictions. Data are presented here bearing on the incidence of various addictions in this college sample and the extent to which subjects identifying themselves as addicted to one experience also report addiction to one or more other experiences. The premise of the PHQ was based on Peele's (1985) assertion that individuals know if they are addicted and can tell you if asked. The data were examined with a view to whether or not this assumption is a valid one for studying addictions through brief self-report questions.