I have a friend who is an alcoholic?

My friend is an alcohalic and will be dead or in jail if he doesn't change. He knows he engages in self destructive behaviour when he drinks and does it anyways. He drinks only once in a while maybe two times a month. When he does it is binge drinking that always ends badly. Usually indulging in drugs or fights. How do I tell him that I don't want to be seen with you or hang out at places you do because I always end up being guilty by association or pressured into things that I know is wrong.