My daughter.
Used from age 12 (yes,, twelve) to nineteen and did it all. Meth, ADHD medications crushed into a pillcrusher and snorted, cocaine, psychodelics, a few times s he tried heroin (this taught me a lesson. I thought heroin addicted you the first time, but she did not inject it with a needle. I guess that's worse, according to her). Meth was her big one.
At nineteen she went to live with her straight-arrow brother. It was that or the streets and I'm glad she didn't need the streets. But she knew that this brother would gladly show her the door if she so much as lit up a cigarette. She had no car. Brothers rules were, she cooked and cleaned (he had boarders in his house too) and got a job, no car or not, and no substances in the house. She had to pay rent and living space was mostly in his large basement. One strike she'd be out.
My daughter was sick of the drug life. She listened to him! (She had not listened to us). She got a job and walked back and forth in Chicago weather. She was promoted to store manager. She met her boyfriend and that was her only friend because she did not want to hang out with drug users. She eventually paid herself to go back to school to become a pastry chef and was so good at it she won awards. She bought a house with her boyfriend and now, after twelve years, lives with him in that house, drug free, with their baby daughter, my precious granddaughter. She rocks as a mother.
Nothing we tried to do to help her did any good. She had to decide to quit on her own. Her brother could not have influenced her if she had not been so tired of the drug life (her words).
She is back to being herself again...sweet as pie, extremely bright, a devoted mother, a wonderful daughter and her and her boyfriend basically stay home and don't ever party. It's hard now to believe she ever did drugs...it seems so long ago and she is so different. Just a regular housewife, whose family eats REALLLY well as s he cooks REALLY good, nutritious food. She is into organics and hates to even take an aspirin. She quit cigarettes too and won't let anyone smoke in the house.
There is your happy story and it can happen to anyone's adult child.
Keep the Faith!!!!!!