About a quarter of vapers surveyed report “dripping,” a practice in which e-cigarette juice is poured directly onto the heating element to produce more intense hits, reports MedPage Today.

The limited research done on dripping suggests that the high temperatures that create the thicker clouds of smoke also produce higher levels of volatile aldehydes emissions than those produced by conventional vaping or even smoking traditional cigarettes.

“We still know very little about the short- and long-term health effects of e-cigarette use because these products haven’t been around very long,” said Suchitra Krishnan-Sarin, PhD, of Yale University School of Medicine in New Haven, Conn. “What we do know is that dripping produces more aldehydes than conventional vaping, and many of these aldehydes are carcinogens.”

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