Just finished reading this book. It is the most comprehensive analysis of literature, theory, science, opinion and politics surrounding addiction and drug law that I have found. I definitely need to read it again. He offers some great treatment ideas for addicts. He draws on Buddhism for his title and metaphor, and for many of his recommendations for addicts.
1/29/11 Book got a great review: http://addictiontreatmentmagazine.com/addiction/hungry-ghosts-book-review/