Oh wow. I'm so sorry you're having to deal with this, MisterUnderstood. You deserve better, really.

Unfortunately, as you probably know already, I don't think there's anything you can do to change your mom. I like Christina's ideas about talking to your DCF worker... especially if your mom is still smoking pot (assuming you're not in a state where that's legal).

Are you getting any type of counseling or therapy through DCF, or are they just monitoring the situation? Do you have access to a therapist through your school? Do you work at all on the side (I'm wondering if there's a chance you could find a therapist with a sliding scale fee who could help you, outside of school, if that doesn't work for you).

Please, please hang in there. It's an awful place to be in (not being able to move out, having nowhere to go, and having parents that aren't really sane or competent as parents). It's similar to what I grew up with. My salvation was just making it through to 18 and getting out of the house... do you have a plan for what happens when you turn 18?

Good luck...