Just for fun:
Mcree obviously, but who else?
I imagine Mercy having a secret cigarette when she is stressed. Despite having veiws on it being bad for health.
Ana strikes me as a smoker too. She sounds like my grandma who when she wasnt smoking was chewing tobacco
Widowmaker
20 chars/
None of them. 
Smoking is bad for your health! 
Im sure you could patch me right up doc ![:wink:](https://d74zh8edaijub.cloudfront.net/en/overwatch/images/emoji/twitter/wink.png?v=5" ":wink:")
Junkrat smokes every time he goes explodey…
Rein - a beer and a cigar
Reaper - coz it’s edgy
Junkrat - he just inhales the smoke from his bombs
Soldier probably, maybe Torbjorn. Junkrat probably gets a lot of second-hand smoke.
McCree
Widowmaker
Lucio
Doomfist
Moira
Sombra
S76
Bastion
Zenny… he need a lot of stress relief after seeing Genji running away from the payload for a 100 times…
Although Orisa have a programm preventing her for having such a bad habbit, due to the time she spends with Moira she gets another one…
Also a big duh, Hog vapes.
Sombra! I could imagine her Zarya and Mcree enjoying one together along with lots of varieties of Alcohol.
I think McCree would. He looks like the kind of guy to smoke
And Reaper when he… Um, well turns into smoke. 
I’m still investigating the case of mcree. It’s been 5 months camping outside his house, but I could never catch that rascal!
Day 156:
Dear Diary. Mcreezy has left his hose, but he had some smoke coming off his face. I ran closer to investigate. Before I could see what was on his face, a random battle mercy killed me and her entire team tbagged me. We’lol get em next time
Day 157: wtf my internet is broken
She probably smokes from those long, thin ones, like women did in the 1940’s.
Reaper’s thighs are smokin’ hot.
What?
Well, Roadhog vapes if that counts.
Reinhardt. To get over his depression of getting stunned
I’m here for this comment.
Widowmaker for sure. Can see her with a fancy cigarette holder as well. Reinhardt seems like a cigar type of fella.