The thing about addiction is that the physical dependency can be about the substance, but ultimately behaviors are part of the addiction cycle.  That's the the difficult part and is why people can be addicted to things like gambling which have no substances involved but have similar effects in the brain to the addict.  Also that's why you can get an alcoholic over the physical dependency fairly quickly (a week or two) but the behavioral patterns are much more difficult to break.  For some people, they really never "get over it" and have to battle it for the rest of their lives.

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