IME, addiction is a choice. You either choose to drink, stick a hole in your arm, snort, smoke, and a few others I can't think of right now..........or you don't.
Quit smoking cold turkey, 20 years of Camel non-filter and KOOL shorties. I don't drink cause I like it too much, and get to the point where I have to find the bottom of any bottle I open. Hell, there was a five year period I didn't draw a sober breath. I may or may not have tried some of the 'other stuff'. I CHOSE to stop. A conscious, rational decision.
YMMV, everyone's does.