Only 1 guy I used to hang out with had a drinking problem. He refuses to admit it, refuses to stop, and refuses to get help. I don't hang out him anymore, because all he ever does is sit at the same bar every night, and chug drinks until he's blacked out.
My other friends were always just social drinkers, and I still hang out with them all the time. Had to have "the talk" with them a few months ago. Told them about my problem, how I won't be drinking anymore, and that's that. I also told them to feel free to drink around me, and that I'm perfectly comfortable with that. Maybe I got lucky to have such great friends, but they were all super supportive, respectful, and a lot of them have cut back on drinking themselves. We do a lot of other stuff together now, like hiking, kayaking, etc.