kryzak
I don't "shun" drinking per se. And I don't mind people drinking a couple drinks at an event. But so far it seems that at many "bar of the night" events, people are there just to get very drunk. I don't think that's the kind of stuff banking and consulting infosessions and cocktail parties encourage either. I enjoy talking to people when they've had a drink or two (definitely the "social lubricant" aspect of alcohol), but after 4-5 drinks, only drunk people understand other drunk people. Those are the type of parties and events that I don't enjoy, simply because I am incapable of getting drunk (health reasons).
I get your point, and again, I think everybody will respect that - if they don't they are total losers. But again - like you mention yourself - after a while people get drunk, and there nothing worse than hanging around with drunk people when you're sober (I've done that once, what a mistake). So you have to accept the fact that after a while you won't be able to have any sort of conversation with these people (in the pub I mean) and also that drunks (I mean it in a good way, honest

) will be closer to other drunks.
At all the parties I've been to this month, there were always 2 crowds: the non / social drinkers, and the heavy boozers. I'd actually add that even though a lot of people say that MBA is about boozing, most of the students call it a day once they reach a relative state of drunkness, meaning that you can still have a decent conversation with them even if you're sober; I don't know how it is in the US, but in Belgium uni parties were all about drinking till you drop. You definitively don't see that kind of binge drinking in MBA programs - there are people like that, but not THAT many.
So in conclusion, I wouldn't stress out too much about the drinking issues - you'll probably have a larger potential circle that I will

(I'm part of the drink-till-you-drop-even-if-you-make-a-tit-out-of-yourself category).
PS: one piece of advice though: DON'T be the kind of guy that frowns on drinking as if it were some evil thing to do, because then you'll look like an idiot. But I'm sure you knew that already.
PPS: tough luck about the health issue