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>> i haven't had a drag of a cigarette since about 2 1/2 years ago. >> liquid nicotine is heated up by a battery charged coil. there's no tobacco burned. users inhale and instead of smoke, there's a steam like vapor. so are e cigarettes safe and perhaps the greatest innovation yet to the quit smoking or an addictive be health hazard? >> with a product like e cigarettes you're guilty till proven innocent. we need to know these things are i've and okay to use. >> they've been in the u.s. less than a decade and increasingly big tobacco companies are manufacturing them. limited research has been d...

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 willi...