Pharmacologist Dr. Avram Goldstein. He set up some of the first methadone clinics to treat heroin addiction in California, and has a new book "Addiction: From Biology to Drug Policy" (Freeman). Goldstein argues that addictions are diseases, and must be considered a public health problem. A study released last month may back him up: 500,000 American deaths a year are attributed to cigarette, alcohol and drug use.