Umm...idk if this counts, since I never went to rehab or anything...
I stopped drinking after a s*xual assault (sorry if that triggers anyone), my reasoning being that it wouldn't have happened if I were sober. I managed to wean myself off the weed, painkillers, and other miscellaneous pills mostly by cutting myself off from all my old "drug buddies" (any friends who had used with me/supported my habit(s)). When I moved to a new town, I had absolutely NO connections and NO money whatsoever to continue using. That made it...kinda the only choice left. Now I despise the taste of hard liquor and consider my sobriety VERY strong--which is good, because I don't think I'd have been able to follow an AA-like program!
Oh, and of course, my AODA treatment place, which specializes in teenage/young adult addicts. They are AMAZING!!!! All of their counselors are ex-addicts themselves, which is a REALLY helpful thing. I still keep in contact with my counselor cause she's awesome like that. I went there for about 2 years; when I first started, I was the youngest person there. I can honestly say they probably saved my life (considering I was referred there after downing 2 bottles of pills with a bottle of tequila, and I'll bet almost anything that the suicidality/depression was drug-related).
I should mention--I've been sober for over a year and a half now.