Animal Study Points to Heating Coil Behind Serious Vaping Injuries | Health News

By Dennis Thompson
HealthDay Reporter

(HealthDay)

THURSDAY, Oct. 8, 2020 (HealthDay News) — The type of heating coil used in an e-cigarette and the amount of voltage sent through it could be contributing to vaping-related lung injuries, a new animal study contends.

Laboratory rats suffered lung injuries when exposed to vapor from devices using high-powered heating coils made of nickel-chromium alloy, something that did not occur in earlier experiments using stainless steel heating coils, researchers report.

“When we looked at their lungs, we saw they had very severe damage to the lung structure,” said lead researcher Michael Kleinman, a professor of occupational and environmental medicine at the University of California, Irvine. “We found we got the worst effects in coils that contained nickel and chromium, which is a typical kind of coil.”

E-cigarettes turn liquid into vapor using a heating coil similar to those found in toasters, Kleinman said. The coil is surrounded by the liquid, and when voltage is sent through the coil, it rapidly heats up.

Kleinman and his colleagues were doing vaping research on lab rats using devices equipped with stainless steel coils when they made their discovery.

The manufacturer stopped making the specific device they were using, so they had to switch to a compatible model that used nickel-chromium coils, Kleinman recalled.

“When we got the new coils and we ran them at the high power settings, we immediately noticed after the first set of exposures, the animals were literally gasping for breath,” he said. “They were lying on the bottom of the cages, just huffing and puffing. Their color looked off. Their nose, which is normally pink, kind of looked pale.”

Kleinman noted that the rat experiment used an e-liquid that was a 50-50 blend of propylene glycol and vegetable glycerin (the two main ingredients in most such liquids), with a little tobacco flavor added in. It did not include nicotine, THC or vitamin E additives.

E-cigarette advocates countered that these sort of experiments achieve their results by operating vaping devices in ways no consumer ever would.

“It’s under conditions that normal e-cigarette users would never use,” said Lindsey Stroud, a board member of the Smoke Free Alternatives Trade Association. “An e-cigarette user isn’t going to use a product if it’s burning. They’re going to taste it burning.”

She added that the most popular e-cigarette products — pod-based or disposable — do not have power settings that can be changed by the user.

“Any of your pod-based devices, you really can’t change how you heat it,” Stroud said. “This is done under really strict conditions to get these results.”

However, the American Lung Association says this study is a perfect example of why the U.S. Food and Drug Administration needs to regulate these products more tightly.

“The FDA has the opportunity to take research like this and only permit products that demonstrate their design is appropriate for the protection of the public health,” said Erika Sward, assistant vice president of national advocacy for the lung

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