Carl Hart is a neuroscientist and Ziff Professor of Psychology at Columbia University—he was the first tenured African-American professor of sciences at Columbia. His research focuses on the “behavioral and neuropharmacological effects of psychoactive drugs in humans.”… With genial candor, Hart presents himself as a model drug user. “I am now entering my fifth year as a regular heroin user,” he writes. “I do not have a drug-use problem. Never have. Each day, I meet my parental, personal, and professional responsibilities. I pay my taxes, serve as a volunteer in my community on a regular basis, and contribute to the global community as an informed and engaged citizen. I am better for my drug use.”

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