I tried one of these things the other day.
I was actually somewhat impressed. The vapor is very similar to the amount of smoke you get from a regular cigarette, the taste was "close", and the nicotine level was enough to make me dizzy.
It was a little harder to draw, and the propylene glycol they suspend the nicotine in, left a very sweet taste on the "filter" itself. I'm told this goes away after the "filter" is not brand new. You can refill the cartridges yourself (not on all brands), and overall the cost is considerably less than the Obumble sanctioned cost of good ol' genuine tobacco.
The one I tried was a "Smoking Everywhere Gold 3.0".
You can use them in bars and restaurants, on planes, in malls, everywhere they've forbidden us from smoking.
Anybody else try these things?.