Just read a book last night called "the Craving Brain"...
The craving brain: a bold new ... - Google Books
I don't know whether this link works yet, but google search it if it doesn't. It made alot of sense to why people become addicted to things like alcohol, and also even made sense to why programs like AA works for many people. It also discussed the drug Fen Phen which was able to help people lose weight and it was also helping people with alcohol addiction before it was taken off the market. I understood some of the concepts of dopamine and serotonin before I read the book, but this book sort of put everything into perspective for me. It's a pretty easy read, about 160 pages, and I got through it in one sitting. Anyone who has any knowledge of the book, or ends up reading it I would love to discuss it further.