According to two long-term studies — one American, one British — there's a correlation between smarts and a thirst for alcohol. The "more intelligent children in both studies grew up to drink alcohol more frequently and in greater quantities than less intelligent children,"
Why do smart kids grow up to be heavier drinkers? - The Week
I also like the theory proposed by an associate of mine:
When the lion and other predators hunt at the back of the pack, taking down the slow, sick and less-able, the overall quality of the pack improves. In the same way, alcohol's destruction of brain cells increases the overall average intelligence of what's left as it first takes down the slow and stupid ones.