The Yale research team surveyed 7,000 CT high school students, and they found that among 1,080 e-cigarette users, 26.1 percent of students have tried dripping in the past, NBC News reported.
E-cigarettes are often touted as safer alternatives to cigarettes but they've also been tied to a spike in poisonings.
"Inhaling aerosols from e-cigarettes seems to be less risky as compared to smoking tobacco cigarettes, but "dripping" is not a safe technique for using e-cigarettes and should be avoided", Goniewicz said.
Yale researchers are out with a study that shows more teenagers are trying something new and possibly risky with electronic cigarettes.
Even though e-cigarettes contain fewer toxicants than traditional cigarettes they still contain different chemicals such as propylene glycol and glycerin "which when heated at high temperatures like with "dripping" can produce high levels of carcinogenic compounds like aldehydes", Krishnan-Sarin says.
CT law makes it illegal for minors to buy or possess e-cigarettes, but as the Yale study shows, many have found ways around that. "Reasons for dripping included produced thicker clouds of vapor (63.5 percent), made flavors taste better (38.7 percent), produced a stronger throat hit (27.7 percent)", they added. E-cigarette liquids typically contain nicotine, which is absorbed rapidly through human skin.
Dr. Suchitra Krishnan-Sarin, the study's lead author, said guidance on how to drip is readily available online.
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"The risks of short term and long term use of e-cigarettes are not known", Krishnan-Sarin said by email.
The study didn't examine what flavors teens used for dripping or assess how much nicotine might be in the liquids adolescents used, the authors note.
Sixty-four per cent of the teens admitted they tried dripping to get thicker clouds of vapour so they could pull off smoke tricks.
More on the study published online today in the journal 'Pediatrics'.
Newer e-cigarette devices make dripping unnecessary, Polosa said.
Those most likely to drip were males, white teens and those who were more frequent users of e-cigarettes or other tobacco products.
Funding for it was provided by the National Institutes of Health and the U.S. Food and Drug Administration Center for Tobacco Products.