Pls help, my friend is being reckless?

My friend is joining the wrong company and has started smoking, drinking and having reckless sex. I am very concerned for her, and on asking her, she acted innocent as if she can lie straight to my face. Many people know about this, including her parents, teachers and friends. All of whom have tried to get through to her and failed. Is there something I can do to help her, I'm very concerned that this will destroy her completely. Please give me some suggestions as to how I can get through to her?
Pls help, my friend is being reckless?
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