I stopped for a few months several years ago (to study for the GMAT, of all things). Granted, this coincided with me actively practicing puzzles and trick quest

I stopped for a few months several years ago (to study for the GMAT, of all things). Granted, this coincided with me actively practicing puzzles and trick questions (essentially this is what the high end questions are) but I felt noticeably sharper. Like I'd gained 10-20 IQ points. Prior to this I drank quite often over several years (college plus a few post college years). This break (and my awareness of its effects) caused me to really curb my drinking. Now I drink sparsely and mostly to appreciate a nice wine or beer or well made cocktail. I think there's a balance to strike. Enjoyment in life might be worth a marginal IQ point here and there. I dropped out of bschool but learned this lesson getting myself admitted. Thanks bschool! :D