Medium weight I drink a lot, but only do so occasionally.
A lot of people call themselves heavyweight when they're not, I've lived with an alcoholic (he's a lot better now) ho used to drink himself to sleep, drink in the morning and one time kept drinking for a couple of hours while acting lucid after reaching the upper limit on a breathalyzer .4 (he had stopped for 30min and drank a glass of water to rinse his mouth, to try and make it as accurate as possible) meaning it could have been higher.