<human>: I met this girl a while ago and we actually dated very briefly.  Now we are just really good friends, who occasionally fuck.  But anyway, a couple weeks ago she admitted that she will on occasion do lines of coke.  I have no idea how to approach this.  She was saying it as if it was nothing.  Like it was just pot or a beer.
I guess I don't know if I am overreacting or if I should even try to convince her that its stupid.  I've tried and she said "in my experience, coke isn't really a big deal".  I don't know if this should be something that I should make an ultimatum about, but she would just lie to me anyway....  I care a lot about her and I don't want her to fuck up her life.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: really good friend occasionally does coke, doesn't think its that bad.  I don't know what to do.