You've got the name of one who did in your tags, so unless you are a complete simpleton and just put his name in there for no reason because he's the only boxer you know, then you already know the answer to that question.
sure, smoking has been done by boxers, marihuana is obviously not the best PED, well maybe if you play poker, but in boxing you still get banned harshly IMO for smoking.
Didn't Mike Tyson say his biggest regret in life was not smoking weed with 2Pac when he had the chance? Mike certainly liked his weed.
yea boxers do smoke and they should be allowed to. weed never hurt no one its safer then drinking caffeine Like coke and pepis or coffee it should be legal to use . weed is also used a medicine for head pain muscle pain sleeping disorders and many other medical issues. and if you in cali VOTE YES ON Prop 19 so the rest of the world will make pot legal.
TONS of boxers blaze the chronic. Can't beleive they treat it like a PED and ban you for it though, if anything it'll decrease their reaction time.