It's a device that many smokers use to quit but it could be even more dangerous to their health.
E-cigarettes are battery powered devices that mimics the sensation of smoking a real cigarette by delivering nicotine through a smoke-like vapor.
Marc Liverman explains what has some doctors worried.
Flow Vera says he's been trying to quit smoking for years.
"I've tried patches and gum, just cold turkey and all that and it's not working."
But six months ago, he tried this...an e-cigarette ...and he swears it's working.
"Now that I've switched to e-cigging or vaping, I've cut down on my smoking."
He says it's as simple as loading the device with a flavor of your choice and nicotine in a separate compartment.
"You don't wanna go over your fill line though so you just give it a little bit more. Then it goes together like this and you're ready to vape"
Vera says he's gone from 3 packs a day to a pack a day by using the device, which still contains nicotine. he thinks they're less harmful.
Why would so many people want to be vaping now instead of smoking real cigarettes if it was that harmful?
But some in the medical community aren't convinced. Pulmonary expert Dr. Hafez Hayek at the Conway Medical Center says there isn't any data proving that they're safe.
"Before I would recommend electronic cigarettes as a way to quit smoking, we're going to need more studies, more long-term studies and of course, more regulation and FDA approval.
And for those reasons Dr. Hayek is concerned not only for the users – but everyone around them.
"That makes me concerned you know, if I have somebody here smoking electronic cigarettes are we exposed to it, to the toxins that we don't know what they are.
But that's not going to stop Vera who says as long as it helps him cut down on the real thing, he's all for it.
"If I added up how much nicotine I was taking off cigarettes compared to this it's a lot, lot less."
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