I used to feel the same way about my daughter. That she could just quit if she wanted to. I guess that was less scary to me than to think that she had a disease that was out of control. When we become educated about addiction we know better. The girl must have issues that she is not ready to address. Anyone who has addiction in their family suffers and she must be suffering too. I am sure her comments came from anger as the others have said. I would just not bring up addiction or if it is brought up just not participate. You can't change others, only yourself. Hugs, Marle