Here is a rather long article on the disease theory but it's a good read:
Submitted by Baldwin Research Institute Fri 01/27/2006. Addiction Info.
"In 1976, the writer Ivan Illich warned in a book, Limits to Medicine, that 'the medical establishment has become a major threat to health'. At the time, he was dismissed as a maverick, but a quarter of a century later, even the medical establishment is prepared to admit that he may well be right. (Anthony Browne, April 14, 2002, the Observer)"