I have kind of a genetic disorder passed on by my grandmother's side of the family.
I build up tolerance to alcohol extremely rapidly.
I used to drink like a fish until I downed quart of vodka followed by a quart of raki in under two hours a few years back and didn't notice any difference in the way I felt.
I figured; what's the point then?
Now I have a Belgian or other special brew beer once or twice a week just for the taste and that's it...