Among some of the fighters of the past, read about the drinking habits of Harry Greb, Mickey Walker, and Lew Jenkins.
Forgot his name, but there is a guy on the oldtimers threads who claims to have known and sparred with a lot of the old guys from the 30's, 40's etc. He mentioned that one all time great, may have been Pep, just drank all the time and barely trained. Seems to be a pretty commom theme from the guys from those days.
I think it's fair to say Hatton drinks. Thinking about it he must have done a fair bit of passive smoking in bars and clubs over the years as well.
Im sure most drink - especially after a fight. I think that the smartest ones wouldn't smoke... I mean- that has to be the antithesis to having a good roadwork regime...