https://www.youtube.com/watch?v=EL3AuyOfBtII guess this is opinion of all who don't smoke e-cigarette.
No, e-cigs are not healthy, exactly the same as cigarettes are not. Another XXI century bullshit hype, in 10-20 years they will have something newer, better, more healthier, and e-cigarettes will be considered deadlier than classical ones.
I don't smoke regular cigarettes, but first time i've used e-cig i almost threw up and got headache for 2 hours. Also, i want to beat the shit out of anybody who smokes this crap in restaurant/bar/bus/train/etc. and explains it as "not harmful with beautiful aroma", f**k You i say, i prefer to eat my dinner in poisonous tobacco smoke than in some cheap imitation of perfume from someones else lungs. It's not smelling "nice", it's more annoying than normal smoke. Yes, i know that they are ones without the smell, but apparently having the one which produces smell is some kind of achivment and it's used very widely.