I don't think anyone was suggesting actually vaping on the plane next to other people - I'm pretty sure that was never cool with flight attendants and/or other passengers.

The question is: if I am not allowed to bring (potentially expensive and/or hard-to-find) e-cigs on board, what do I do when I land? Can I put them in checked luggage? Do I have to throw them out if I forget they're on me? Too bad?

I don't have any answers but I personally use an e-cig to keep me from going back to the real thing (real cigarettes that is).