I think you would be better of contacting a drug/alcohol support place and asking them about how to go about it.
Telling your parents isn't up to you - is it becoming a problem for her, or is it more recreational?
Although it's not exactly the kind of thing that appeals to you (or many others!), she is an adult at the end of the day and it is her choice.
I'd express concern to her about it on your own behalf but I wouldn't risk potentially breaking your parents hearts when she might simply be exploring different experiences iykwim?
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