Think the success rate is about 2 in 30.
First you have to WANT to be clean. The choice is clear though, quit, die, or jail.
Jack
Actually there is another option to quit, die or jail.
I know a lot of my contemporaries in their 60s who still do drugs as a social thing in moderation and are still productive, healthy and happy.
They are the ones who didn't abuse to the point of recklessness in their youth and there are millions like them.
Of course, they are still liable to going to jail--to "protect them from themselves"--which seems almost comical after all these years