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As U.S health officials scramble to identify the root cause of hundreds of severe lung illnesses tied to vaping, one possible culprit identified so far is a line of illicit marijuana vape products sold under the brand names “Dank Vapes” and “Chronic Carts.”

A study published last week in the New England Journal of Medicine found that more than half of patients with the lung illness - 24 of 41 - who were extensively interviewed in Wisconsin and Illinois reported having used the “Dank Vapes” brand.

The New York State Department of Health identified “Dank Vapes” and “Chronic Carts” as products containing Vitamin E acetate, a thickening agent in THC oil that has been a key focus in its investigation into the illnesses. THC is the psychoactive compound in cannabis.

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While Vitamin E acetate is often applied to skin or used as a dietary supplement, the U.S. Food and Drug Administration has warned against inhalation because “data is limited about its effects” on the lungs. The agency has advised consumers to avoid vaping THC oils or using devices bought outside of stores.

The U.S. Centers for Disease Control and Prevention (CDC), which is investigating 380 confirmed or probable cases of lung illnesses tied to vaping, said the condition has not definitively been linked to a specific product or ingredient, including Vitamin E acetate.

The CDC advises against using any e-cigarette or vaping products, since most of the patients interviewed used both THC and nicotine liquids, while 20 percent used only nicotine.

Leading makers of nicotine e-cigarettes, including Juul Labs Inc, British American Tobacco and Imperial Brands, said this week their products do not contain Vitamin E compounds or THC.

Packaging using the “Dank Vapes” name until recently was available on Amazon, according to caches of the product links, and a Reuters review shows they are still widely available elsewhere on the Internet.

Amazon.com said it took down vape paraphernalia this week in line with its policies, though the company did not specify the exact products it removed. It said THC and e-cigarettes were not, and are not, offered on its platform.

One merchant that appeared to sell packaging for Dank Vapes and another brand on Amazon was known as Cart Essentials, according to the cached links, which are now defunct.

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Cart Essentials had 39 ratings this year, almost all of them five stars. The merchant did not immediately respond to a request for comment sent via Amazon’s platform, and Reuters could not determine who was behind the company.

Marijuana extracts used in vaping “pens” have been one of the fastest-growing segments of the cannabis industry in recent years. It is an easy way to use the product, can be concealed, and users can better control how much they take in, said David Downs, California bureau chief for cannabis website Leafly.com.

The category grew from 2 per cent of the legal market in 2014 to 16 per cent last year, according to BDS Analytics, an industry tracker.

The “Dank Vapes” brand is an illicit product that uses diluted THC oil, Downs said.

Drug dealers, looking to make as much money as possible, cut THC oil with Vitamin E acetate to dilute it but make it still appear pure to consumers, Downs said. “It can cut THC oil while keeping it thick.”

It is difficult to determine whether “Dank Vapes” is an actual company or a brand used by multiple operators. No one responded to calls and emails sent to numbers and addresses listed on a website, dankvapes.org.

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New York Governor Andrew Cuomo directed the state health department earlier this week to subpoena three companies he said market Vitamin E acetate to vape oil manufacturers. The three companies are Honey Cut Labs LLC in Santa Monica, California; Floraplex Terpenes in Ypsilanti, Michigan; and Mass Terpenes in Amherst, Massachusetts.

Cuomo’s office in a statement said the thickeners were being marketed as a “cheaper, safer alternative that does not negatively impact flavouring or odour” and “can be used to cut vape products to any level of THC.”

Honey Cut and Mass Terpenes could not be reached for comment. Floraplex said in a statement it will “work with all appropriate governmental agencies in a transparent and constructive way,” and continue its “distribution of quality products.”

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