Slasher,
Actually, it's been 7 days for me now without the 'real thing' whilst, as you put it, I've been shagging a rubber doll.
I took a few days of transitioning from real fags and then I went totally e-cig, I use Marlboro e-Liquid and once tasted one realises that a real fag gives the same taste as the liquid aswell as cancer and one hell of a hole in one's pocket etc.
I can understand the airlines not allowing it, if you were sitting a few rows behind an e-smoker seeing clouds of smoke/vapour emitting then you'd be excused for believing they were smoking!
But there are ways around it, it only emits a water vapour that one can swallow, they are virtually odourless etc. however, a week in to smoking e-cigs I can feel the addiction lessening which should make it much easier to survive a long-haul flight without a craving.