The study consisted of saliva and urine tests from 67 e-cigarette-only San Francisco-area users, 16 users of both cigarettes and e-cigarettes, and 20 age-matched controls who had not used e-cigarettes or nicotine, the American Academy of Pediatrics said.
While some regard e-cigarettes or vaping as a safer alternative to smoking, the study says vaping is still poisonous and fruity flavors popular with teens appear to be the worst.
Additionally, Dr Rubinstein said the chemicals used to keep e-cigarette solutions in their liquid form, propylene glycol and glycerin, are safe at room temperature but toxic when heated to the temperatures required for vaporization.
"Among our e-cigarette-only participants, the use of fruit-flavored products produced significantly higher levels of the metabolites of acrylonitrile", they wrote. Now, a new study shows adolescents who use them are exposed to significant levels of chemicals that could potentially cause cancer.
Other teams have found other potentially cancer-causing chemicals in e-cigarette vapor, including diacetyl, the chemical blamed for causing "Popcorn lung" in workers at microwave popcorn packaging plants.
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"Unlike adults, particularly cigarette smokers, who commonly report a desire to quit smoking as a main motivator for e-cigarette use, youth are more likely to cite curiosity as a reason to try e-cigarettes".
When used as a predictive factor, any e-cigarette use was positively associated with current established smoking (OR = 1.80; 95% CI, 1.04-3.12); however, no statistical significance was observed regarding the connection between e-cigarette use and established smoking or smoking within the past 30 days.
'Teenagers should be inhaling air, not products with toxins in them'. In 2016, the CDC reported that 11 percent of US high schoolers had vaped in the past 30 days. However, several public health groups, the CDC and the surgeon general's office believe that vaping first gets teens addicted to nicotine, which ultimately leads them to regular cigarette use.
Dr Rubinstein said: 'I do not think teens are aware of the risks.
The Tobacco Vapor Electronic Cigarette Association responded to the study citing a government report from January that found there's no available evidence e-cigarette use is associated with cancer.
The individuals who just vape had more elevated amounts of specific chemicals in their body than customary smokers and nonsmokers, fixing to the "flavoring" utilized as a part of numerous vape items.