Yes, according to this study:
Does drinking alcohol shrink your brain? - CNN.com
Not that this is any new news for you, but just another reminder from scientists how damaging alcohol can be to the human mind and body. When I was in graduate school I remember a lecture in which the professor showed slides of a "normal" brain compared to that of an alcoholic, and it was amazing how much smaller the alcoholic's brain was. This is indeed frightening considering how many years I abused alcohol. Sigh...