There is, iirc, a decent span of time that is not recorded in regards to Jesus and his day to day life. Its possible he could have done pretty much anything during that time. Smoked, had sex, ran the worlds first McDonalds, who knows.

That being said, just because something is possible doesnt mean its probable. I cant say one way or another, since I wasnt there, but considering how harmless and widely used Pot is and was, I wouldnt be overly shocked to find out that jesus did smoke. Back then, it wasnt a big deal, and didnt have any kind of stigma that it has now.