Most addition therapies work well while a person is engaged in it but as soon as the person comes back to their old life style it comes back.
You need to change your life to change the habits otherwise is near impossible unless you have very strong willpower, which most people with addiction don’t.
I think there is another way of getting rid of addictions: I heard of multiple people that quit smoking form one day to another which usually has a very low chance of success (~3%). One thing they had in common: They pursued their addiction and one day got so horribly sick that something changed. I think the Sinclair method follows a similar approach. Give alcohol addicted people naltrexone which blocks the rewards from ethanol but keeps the nasty side effects and then let them drink as they like.