Have you tried e-cigarettes?

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So if you've ever visited an online community for smokers who have switched to e-cigarettes (communities such as e-cigarette-forum.com) you'll see that e-cigarette users everywhere are absolutely raving about these devices! And most of them have kicked the regular cigarette habit for good! Actress Katherine Heigl even raved about her e-cigarettes on the David Letterman show recently: http://www.youtube.com/watch?v=ysGyfLwwr1s So I'm curious, if you've tried e-cigarettes, what did you think? If you're a smoker, and you have not tried e-cigarettes, why haven't you? Is it because you've never heard of them? Or you've heard of them, but don't know much about them? Or maybe they're banned in your country? Or you're worried they are dangerous for your health? Or maybe you think they're too expensive? Tell me, what is your reason for not trying them?? If you're a non-smoker, have you heard of e-cigarettes?