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Addiction’s biological basis has been the focus of much research. The findings have per-suaded experts and the public that drug use in addicts is compulsive. But the word “compulsive ” identifies patterns of behavior, and all behavior has a biological basis, includ-ing voluntary actions. Thus, the question is not whether addiction has a biology, which it must, but whether it is sensible to say that addicts use drugs compulsively. The relevant research shows most of those who meet the American Psychiatric Association’s criteria for addiction quit using illegal drugs by about age 30, that they usually quit without professional help, and that the correlates of quitting include legal concerns, economic pressures, and the desire for respect, particularly from family members. That is, the correlates of quitting are the correlates of choice not compulsion. However, addiction is, by definition, a disorder, and thereby not beneficial in the long run.This is precisely the pattern of choices predicted by quantitative choice principles, such as the matching law, melioration, and hyperbolic dis-counting. Although the brain disease model of addiction is perceived by many as received knowledge it is not supported by research or logic. In contrast, well established, quantitative choice principles predict both the possibility and the details of addiction