I'm sure there were some previously, but are there any fighters on the current roster that are known to be smokers? (of cigarettes... we know they all hit the weed).
Cerrone would look the part with a Marlboro hanging out of his mouth.
I don't know about tobacco, but Jon Jones used to be a marijuanas addict.
Nick Diaz smokes marijuana cigarettes and has some of the best conditioning of any fighter ever.