A common vitamin E chemical could be the cause of the vape-related illnesses that are rising across the country.

High levels of vitamin E acetate were found in nearly all cannabis-containing vape products tested by the New York State Department of Health, the agency said Thursday.

The vitamin supplement is known to be safe when ingested or applied to the skin, DOH said.

“However, the Department continues to investigate its health effects when inhaled because its oil-like properties could be associated with the observed symptoms,” it added.

New York has gotten 34 reports of people ages 15 to 46 suffering severe pulmonary illness after using at least one cannabis-containing vape product.

Vitamin E acetate was not found in nicotine-based vape products that were tested.