People talk about going cold turkey, or using hypnosis, etc..or otherwise being able to train their brain ("reboot" it) from "addiction", to change their associations with the substance they're trying to quit.
Michael Pollen also has a new book out "How to Change Your Mind" which takes a scientific, research based, approach on effective drugs that "reboot" the brain, and are effective in stopping addiction, or treating trauma (PTSD, rape, etc..) but were abandoned in the 60's when their acceptance by the hippy counterculture made any valid research on them taboo.
I was once talking to a doctor friend about addiction. He said: "I don't believe in it. It's a made up word." That statement really stuck with me. I think it's true.
(Funny how if you make up a word, for a made up concept, or "condition", it somehow becomes a real "thing", but I digress. Consider how people are "addicted" to things that aren't even ingested: like gambling, or video games, or other behaviors. IMHO, it is totally a mental condition and very little to do with the cravings your body experiences.)
Sure, substance have an effect on your body, and your body has physiological cravings (for a while, until it adjusts as the levels in your body decrease), but are you saying your mind has no control?
B.S.!! I don't buy that. I believe in "free will" (or at least the illusion of it).
p.s. If I could only kick my sugar addiction. Now that stuff is really POISON!