I personal think that it's bullshit, but there is a few stories of people who was smoking for 10 years and with electric cigarette stop smoked. I'm a smoker and i would like to stop that's why i need your advice.
If you are a smoker, then maybe electric cigs might be useful to help you quit smoking. That said, do watch out for them exploding; or, maybe its their lithium batteries. Anyway, take care. Perhaps, a nicotine patch, or chewing gum, would be best for that transition phase when you kick the habit.
But, for non-smokers, e-cigs are poison; they serve no purpose because not only do they have the same amount of nicotine as regular 'smokey' cigs, they also contain additional hazards.