E Cigarette .. your thoughts?

What do you think of E Cig's?  I have never been a smoker. I do like the look of E Cig's are they dangerous? do they cause cancer?  I think people should be allowed to smoke those in public as they don't smell like anything and don't put me (non smoker) at risk of cancer, nor do they turn my white walls grey/black etc
your thoughts?   http://www.nytimes.com/2013/08/30/business/media/e-cigarette-makers-ads-echo-tobaccos-heyday.html?_r=0

I heard about a real artist getting arrested for 'graffiti'...what does #Banksy do again? what's the difference? (see link)   http://ow.ly/q1wBb