yeah, you have cravings for anything you get addicted to and quit. it's like quitting smoking or whatever, you'll still have cravings because if you get addicted to anything...food, sex, drugs, cigs, your brain becomes permanently wired to be an addict.
it is possible to kick a smack habit and never do it again but it would take a very strong willed person to manage something like that. the majority of those who get addicted to it and quit don't stay clean forever.
i have no clue about the dopamine thing.
hope this helps.
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