Welcome. I'm kinda new since I'm rarely here.
Yesterday I talked to my mom and said something I shouldn't have about her life. I was trying to control it basically because I "knew" I was right and she was wrong.
But it isn't my problem and your mom's drug habit isn't your problem.
I told my mom how I felt and then told her it was her choice if she did anything about it, but I really didn't care. And I don't.
I don't think my answer is necessarily the way things should go with you, but right now it's how my situation is going. I'm JUST starting to figure things out, though. I hope you and I both make some progress in becoming healthy adults.