I use a kanga subtank mini on a kbox mini - and mostly liquids from BordO2, a French producer of some repute. This isn't some pile of parts I scraped together in which I'm smoking shale oil...
I'm one of the "thick clouds" crowd - because my first attempt to switch from "traditional" cigarettes failed because the feel of smoking was missing. I'm now on nicotine-free oils, and plan on stopping outright over the next few months, as the physiological need is now beaten - just the psychological "what to do with my hands" end of things to treat.
As to why I think it's a good idea - don't know if I do, but I think it's a better idea than smoking. I'm no longer constantly phlegmatic, I don't wake up in the morning out of breath, I can taste things again, I've stopped wheezing. Those all seem like good things to me.
Finally, I've never seen someone going "cough cough urgh" at a fog machine at an event or disco - and it's the same damned stuff.