One-quarter of American teens who have experienced e-cigarettes have also tried a potentially unsafe vaping method called "dripping", a new substance abuse behavior study revealed.
E-cigarettes are battery-powered devices with a heating element that turn flavored liquid nicotine into a cloud of vapor users inhale - all developed by big USA tobacco companies.
Dripping is drastically different from normal vaping that slowly releases the liquid.
But dripping the liquid directly on the coils generates far higher temperatures than traditional vaping, leading to greater emissions of harmful chemicals like formaldehyde, acetaldehyde and acetone.
Krishnan-Sarin said more research is needed to figure out if dripping is something tried once or occasionally, or if kids regularly drip - a question not asked in the survey.
Among the teens surveyed, 64% said they dripped for the thicker smoke, 39% said it was for the heightened flavor, while 28% said it was for a stronger hit. Of those students, 26 per cent had reportedly tried a hack known as "dripping".
They said while studies have looked at the dangers of the devices, marketed as stop smoking aids, research must also focus on what happens when they're misused.
In recent years, electronic smoking products have become increasingly popular among teenagers, some of whom may use an e-cigarette but would not otherwise try a tobacco product.
Electronic cigarettes are battery-operated devices that heat liquid and turn it into vapor - instead of smoke - which a person inhales.
From those who answered more than 25% mentioned that they have tried an alternative vaping technique known as dripping.
Funding for it was provided by the National Institutes of Health and the U.S. Food and Drug Administration Center for Tobacco Products.
But a new set of experiments performed in the United Kingdom have shown lung tissue is barely affected at all by e-cigarettes - compared to the crippling affect cigarette smoke has one our organs.
"The other thing is, nicotine is addictive", Carpenter said.
Krishnan-Sarin agrees: "What I always tell parents is that we know very little, I think, about the short and long-term effects of e-cigarettes".
Responsible stores demand ID from everyone and will not sell e-cigarette equipment to anyone under the age of 18.
"This is one of the reasons why teens seem to like these devices", Krishnan-Sarin said.