Would you care to elaborate? I'm open to opposing views. Why do you think using a non-toxic vapor on a plane might be a problem? What problems do you see with vaping on a plane?
Well, the problem I have with using electronic cigarettes is because the illusion of smoke it creates. I wouldn't want my grandmother (if I had one!) to see some huge cloud of smoke on the plane, while she is being scared just by looking out the window!
I feel like it would alarm people, especially now after you know what. While I do not agree on most of the regulations we now have in the airport, especially overpriced coffee

, I believe that e-cig users can wait until the plane has landed until they blow vapor rings.
Now, with all these crazy (mostly cool) mods, these things are looking more and more like destructive devices (map tank anyone?).
I just feel that it would be better, not so much the health aspect (second hand vapor lol), but the unnecessary acts of alarming people who are unaware of these things.
While I do enjoy my joys ego passthrough attached to a home-made map tank, I can wait until I land to take a few nice clean breaths of nicotine.