The great Peter Hitchens debated actor Matthew Perry on this very topic recently. Hitchens, as usual, leaves his opponents scrambling for words.
The video is well worth 10 minutes of your time. Hitchens (rightly) blasts the notion that addiction is a disease, noting there is no actual, objective proof of this but rather that drug use is a choice: ‘people like taking drugs and don’t want to stop.’ Meanwhile, Matthew Perry is mumbling something about an ‘allergy of the body.’
(h/t to Reason)