Hey there. I'm really sorry about your situation, and hers as well. My honest suggestion is approaching her concerned, and raise the situation to her in a gentle way. Ask her how she's doing, and tell her that you need to speak to her about something. Let her know that you are worried about her health and well being. Tell her the dangers of smoking and drinking (even socially), and that her health and life are so important to you.
I know it is frightening, and you feel that you will get the worst, but no matter what, the most important things was that you were honest, concerned, and calm.
Thank you for responding, I appreciate the advice. I hope things get better for her and that I'll start feeling better too. I'll try texting her later today or tomorrow so I don't seem super pushy about it. I'm just worried about the path she's taking rn and I want her to be safe