Another negative study about e-cigs.

This one is from the University of California, San Francisco (one of the leading anti-tobacco schools in the nation). It found that vapour from e-cigarettes not only contain carcinogenic chemicals, it also found that sweet, fruity-flavoured e-cig flavours are the worst for delivering carcinogenic chemicals into the lung.

These chemicals do not show up in the “ingredients” of e-cigarettes.

From an NBC story:

The chemicals are not listed on the ingredients of the vape liquid. They’re found under the catch-all description of “flavorings”, the researchers said.

Dr. Mark Rubinstein, of UCSF’s Division of Adolescent Medicine, and colleagues tested 67 teenagers who vape and compared them to 16 teens who both vape and smoke tobacco cigarettes and to 20 teens who do not use either type of cigarette.

They tested their urine and saliva and asked questions about cigarette use.

Those who used both types of cigarette had significantly higher levels of dangerous chemicals, including acrylonitrile, acrolein, propylene oxide, acrylamide and crotonaldehyde, the team reported. And those who used only e-cigarettes had much higher levels than those who used neither product.

“Among our e-cigarette–only participants, the use of fruit-flavored products produced significantly higher levels of the metabolites of acrylonitrile,” they wrote.

Glycerin and other flavorings in both tobacco and e-cigarettes can react with one another or break down into the potentially harmful chemicals.

“Acrylonitrile is a highly poisonous compound used widely in the manufacture of plastics, adhesives and synthetic rubber,” the National Center for Biotechnology Information says on its website.

Acrolein “is toxic to humans following inhalation, oral or dermal exposure,” the Environmental Protection Agency says. Some studies show it can play a part in bringing about lung cancer, although the EPA says there is not enough data to show whether it causes cancer in people.

Propylene oxide and crotonaldeyde are probable carcinogens, the EPA says, while acrylamide’s role in causing cancer is more controversial.

 This is just the latest in countless studies showing that e-cigarettes are — at BEST — not completely benign and really should be avoided by teens … and more should be done to dissuade teens from using them. They might be better than cigarettes, and might be a viable option for a smoker to quit cigarettes, but they should not be used by teens as an alternative delivery system for addictive nicotine. The best choice is to simply avoid nicotine in any form … period.

Another nail in the coffin on the idea that e-cigs are completely safe. Again, I’m a bit ambivalent on e-cigs, but it does bother me — a lot — to see them pretty blatantly marketed to teenagers. Like Medical News Today states … teenagers should not be using e-cigarettes at all.