Thanks for the advice. Hope you don't mind me asking questions about it - but do you think that I'll have to wait until she realises she has a problem? I'm getting to the point where I want to do different things at the weekend and go out with the old group again but because there are no drugs there anymore so she's not up for coming. I feel that I should continue to hang around with her and this guy so that I can keep an eye on her (even though there's nothing I can do). I'm just dreading the time when she begins using it during the week.
She still lives with her parents and I was even thinking about telling her mum who is totally oblivious to it but I think it will do more harm than good so I'm going to keep quiet for now. I just wish she had never discovered it in the first place or at least got sick of it like I did. Thanks for your help though.