Please help me

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My bestfriend just messaged me saying she just did a line of cocaine.

My heart sank, she has never done drugs before and she has a new boyfriend who got her to do it ( a boyfriend I don't approve of )

What do I do. I told her I'm disappointed and I don't roll with shit like that and we hung up the phone.

I know nothing about cocaine. How bad is it? Please give me your experiences.

I'm not ready to lose my friend to drugs. What do I do. Please.