It's very interesting you should say that.
I've recently read a book called 'The Heroin Diaries' by Nikki Sixx (motley Crüe bassist), he was addicted to heroin, it basically took over his life, he wasn't interested in money, fame, or women, he just wanted his fix of heroin & went to extraordinary lengths for his addiction.
After many years of abuse, he woke up one morning and just said "enough, I don't want this anymore".
He's been clean ever since.
But did he go to rehab to get over the addiction?
I find it hard to believe he just woke up one day, said 'no more' and never took it again. If it was that
easy, every addict would be able to do it, and like every human being, all addicts are different.