[Reaper]

But it is not just water vapour that e cigs emit. The vapour is comprised of propylene glycol, vegetable glycerine, flavouring agents and nicotine. I don't care too much about these things because they are less offensive than carbon monoxide and smoke but I hate it when the users claim it is just water vapour.
One time on an elevator while I was in the U.S. someone whipped out an e cig and started going to town and several people gave him the stink eye. He exclaimed "it's just water vapor!" One dude mustered up the nastiest fart and proclaimed that "there's no reason why one person should be exempt from being offended by the smell of the elevator." Everyone plugged their nose but one of the other occupants of the elevator gave the fartist a high five. Thankfully I was off the elevator in a floor or two because the dude was clearly eating a diet high in garlic.