It is possible to identify a psychology of adolescent addiction that cuts across class, age, racial, and gender barriers. This psychology is a function of the internal relationship between psychoactive drugs, the user's brain, and the user's personality characteristics as they are shaped by events in the external environment, regardless of how "good" or "bad" it happens to be. Chatlos and Jaffe have devised a developmental bio-psychosocial disease model of adolescent addiction that provides a useful framework for organizing and understanding data generated by research studies and also facilitates treatment and prevention initiatives. With some limitations, the model can be applied equally well in diverse populations of adolescents. After describing the elements of this model, which focuses on the prevention and treatment of adolescent drug addiction, the paper discusses the implications for public policy. The author advises that substance abuse in America is a public health problem that requires public health solutions. As such, treatment for all addicts should be available on demand in cities, suburbs, and jails. State-of-the art marketing campaigns should target the teenage population. Because racism and sexism are endemic in all ethnic groups, demonstration of cultural competence at a personal level should be a minimum standard for public agency officials and other professionals who wish to work in the field, including adequate education and training in adolescent psychology and substance abuse. Appended outline of the characteristics of substance abuse and substance dependence and 38 footnotes