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we met him at henley, a new york city vapor lounge. >> i haven't had a drag of a cigarette since two and a half years ago. >> reporter: here's how they work. liquid nicotine is heated up by a battery charged coil. there is no tobacco burn. users inhale and instead of smoke, there's a steam-like vapor. they have been in the u.s. less than a decade and increasingly big tobacco companies are manufacturing them. but limited research has been done on their health impact. >> i would like the science to catch up with what we're doing here. >> reporter: but you're still willing to do it. >> i am willing to do it because i think the alternative to just smoking all day, i think this is a better alternative. >> reporter: amy fairchild of columbia university school of public health co-authored this op-ed in the "new york times" making the case for e-cigarettes. a lot of folks say there's just not enough science. >> you can also make the case there is never going to be enough science, that there is always going to be room for another study. it's the dire urgent public