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CDC officials said some laboratories have identified vitamin E acetate in product samples and are investigating that as a possible cause of the illnesses.

Public health experts have not found any evidence of infectious diseases and believe the lung illnesses are probably associated with a chemical exposure.

Megan Constantino, 36, from St. Petersburg, Florida, quit vaping six days ago after hearing reports of the illnesses and deaths related to vaping.

“It scared me into quitting,” she said.

Like many users of vaping pens, Constantino picked up the device after quitting cigarette smoking three years ago, and said, “It’s the hardest thing I’ve ever done.”

She added, “I threw the last cartridge away. I took a picture of it and I literally cried.”

Constantino said many people who vape have been “on pins and needles” for the investigation results, and she is concerned that the reports of a link to vaping THC may give people an excuse to ignore the warnings.

E-cigarettes are generally thought to be safer than traditional cigarettes, which kill up to half of all lifetime users, the World Health Organization says. But the long-term health effects of vaping are largely unknown.

The U.S. Food and Drug Administration has faced mounting pressure to curb a huge spike in teenage use of e-cigarettes, a trend that coincided with the rising popularity of Juul e-cigarettes.

“We must not stand by while e-cigarettes continue to go unregulated. We urge the FDA to speed up the regulation of e-cigarettes and remove all unregulated products from the market,” AMA president Dr. Patrice Harris, said in a statement.