Zeller said the FDA has collected and is analyzing more than 150 vaping product samples from a number of states for "the presence of a broad range of chemicals, including nicotine, THC and other cannabinoids, along with opioids, cutting agents or dilutions, and other additives, pesticides, poisons and toxins".
Health officials urged people not to buy vaping products off the street or modify them.
"In cases like this, we typically turn to [the] OCI", said Mitch Zeller, the director of the Center for Tobacco Products at the FDA. "The focus of their work is to identify what is making people sick, as well as a focus on the supply chain".
Despite rampant fears among parents about youth vaping, only 16% of vaping victims are younger than 18 years old, according to Dr. Anne Schuchat, principal deputy director at the U.S. Centers for Disease Control and Prevention.
"The specific devices and/or substances that are responsible for the lung injury remain unknown and therefore our guidance has not changed: E-cigarettes and vaping are not safe and people should avoid using e-cigarettes and vaping until the cause of this outbreak is known", said Dr. Jeff Duchin, Health Officer for Public Health - Seattle & King County.
Nacca believes many of these vaping-related cases have been underdiagnosed.
"We're facing a true epidemic in this country", DeGette said in a statement.
The president of the Canadian Medical Association recently said youth vaping has become a public health crisis.
The outbreak has affected users of both nicotine-containing products and those containing THC.
A man in his forties has become the eighth person in the USA to die from smoking e-cigarettes as the number sickened by vaping rises to 500.
Meanwhile, several TV networks - including CBS, WarnerMedia and CNN - say they will no longer air ads for e-cigarettes. Many patients have reported using THC and nicotine. Adults using e-cigarettes to quit smoking should not return to cigarettes, Schuchat said, but instead should talk to a health care provider about other tools to help them quit. No one substance has surfaced in all samples.
Middlesex-London Health Unit didn't say if the London teen had been vaping a cannabis product.
Jim Reiter said the directive was issued so the Health Ministry can monitor vaping-related illnesses.
Missouri DHSS began advising, and now requiring, physicians to report possible vaping-associated pulmonary illnesses in late August and since then has received 22 reports from throughout the state of Missouri.
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