Well, withdrawal is a bummer but it's only insurmountable when one doesn't actually 100% wish to be done with the addiction. Alcohol took me 5 tries over about 3 years. And when I finally did put it down it was down, no trouble, because I had come to truly not only fear my addiction but to actively despise everything about it, every single behavior I'd accumulated that were attendant to the whole twisted process of boozing it up. I have no things about drinking that I miss. Nothing. Not even the people. Same with tobacco, which was way harder to quit and far more damaging to get to the point where I finally so hated it and everything I did associated with it that I just had to remove it from my life or die. You have to be really done with whatever the addiction is to really be able to walk away and stay away from it.