Someone with a substance abuse problem is the only person that can tackle that issue. Attending alchoholics anonymous or narcotics anonymous (or a similar 12-st

Someone with a substance abuse problem is the only person that can tackle that issue. Attending alchoholics anonymous or narcotics anonymous (or a similar 12-step style program) can be a start, and it is really helpful if said person attends therapy with a professional of some form outside of those kinds of programs (church staff don't count, this absolutely should be a trained therapist, psychologist, etc). Outside of that, there isn't anything you can do. It should be noted that not talking to someone with a substance abuse problems is a wholly legitimate thing to do, as you aren't required to put yourself in situations that are harmful to your own mental and physical well being.