it hurts you even if you think it doesnt. when im playing on the way home i can recall what i couldve done better or where i messed up. If im drunk like in vegas i know i went broke but cant remember why-hence my game wont be getting better from learnign from the session. also it makes you catch things more and not play quite as loose. I recall drinking and noticed it was a large bet from an amatuer but thought eh I cant fold top pr - and i shouldve- i remmeber ealier in the night when i was stone sober id make that fold and it was correct against someone else. Little things you may not realize. we all like to have a few drinks playing, esp in vegas, but if you're serious about making money that session you really shouldnt drink.