I'm going to hazard a guess that any field, at a certain level, has these issues because so much of it all comes down to personal relationships and making deals...which happen over drinks (historically). I'd be curious to learn more about high-functioning organizations without an alcohol culture - what do they do instead?
Though I do sometimes drink, I've never felt uncomfortable ordering a water, a non-alcoholic beer (more commonly in Europe), a soda, or a coffee at a place where "everyone else" is drinking.
That may not seem as comfortable in Japan or China, but in Europe, India, and America, I haven't felt the least bit self-conscious or pressured beyond the occasional "Oh, no beer for you?" "None for me, thanks." interaction.
Some US friends and coworkers openly discussed this “weird relationship” Americans have with alcohol and how it develops during high school onto college. Can’t comment on that but it fits my anecdotal experience.
Probably the medical industry as a whole has less of this, I'd assume.