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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