Psychological drug addiction feels a lot like food addiction - if you've ever dieted then thought about how amazing it would be to order pizza, you've experienced the same thing (though ofc to a far lesser magnitude)

You stop doing drugs the same way you stop eating badly, by trying to find substitutes, and by putting distance between you and it (i.e. if I don't want to eat snacks, I avoid buying it at the store, so it's more work for me to eat poorly)