I seem to recall drawing another version of this cartoon at some point, although I cannot remember where it is now. It may have even been funnier than this one (although that's admittedly not hard to do). It had two guys standing next to each other. The first guy lights up a cigarette and asks his friend "Mind if I smoke?" And the other guy asks, "Mind if I do?" The punchline is that the second guy is on fire, or something off-the-wall like that.
I think this version is more suitable for online display. Cruelty to leaves is far more tolerated than cruelty to cartoon people.