My poison was always crystal meth or ecstasy, and for a spell it was inhalants, but alcohol would be a close fourth.
For what kind of alcohol, beer, but not just any beer: porter; specifically Sierra Nevada Brewing Company porter. I still crave that taste once in awhile...
I was a wreck when I overdid it with booze, which was often enough to warrant quitting drinking along with everything else. The other stuff would have killed me really quickly.