[url=http://en.wikipedia.org/wiki/Electronic_cigarette]Here[/url] is a Wiki page on the subject.
From what I see, it's basically a cigarette without the actual flame and smoke and tar, etc. However, there's not much else I know, just saying.
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That wiki had a lot of relevant and interesting information. Of particular note: [quote]hIn Washington, the King County board of health has banned smoking of electronic cigarettes in public places, and prohibited sales to minors. Neighboring Pierce County also prohibits sales to minors, but allows e-cigarette use in places such as bars and workplaces.[/quote] So an e-cig would be banned in public places. Odd, since it doesn't involve the burning of anything and that state just legalized.... oh, wait, I said that I wouldn't discuss that subject, and I won't. I would be curious if any of my Seattle-based friends are aware of the details of this ban.