Numerous patients reported that they had used e-cigarette products with liquids that contain cannabinoid ingredients, such as THC.
Reported symptoms include cough, fatigue, dizziness, headache, vomiting and diarrhea, chest pain and worsening difficulty breathing, Kendrick said.
Health officials in some states have said a number of people who got sick had vaped products containing THC, the compound that gives marijuana its high.
"Even though cases appear similar, it is not clear if these cases have a common cause or if they are different diseases with similar presentations, which is why our ongoing investigation is critical", CDC Director Robert Redfield and acting FDA Commissioner Ned Sharpless said in the statement.
That's a critical distinction in the OR case, according to the American Vaping Association, which has blamed the recent spate of lung illnesses on illegal vape pens that contain THC.
President Gregory Conley says in a statement the ban "will create a massive, multi-million dollar black market for these products, which are the same conditions that led to the recent spate of lung illnesses that are now clearly linked to illegal THC vaping products".
Kafoury said she's lobbied for a state tax on e-cigarettes as well, adding that more needs to be done to combat "the myth" that e-cigarettes and vaping are safe.More news: Modi, Putin to sign 25 pacts at upcoming India-Russia annual summit
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Investigators are focusing on marijuana-derived THC in the Minnesota cases of teens and young adults who developed vaping-related lung illnesses this summer.
The DOH is seeking more information from healthcare providers to determine if there are other reports that require investigating.
Thomas said that "we want the public to know this is a real danger ... young people, pregnant people, people who are not already vaping should not vape". "But we still have very few regulations in place, even for commercially sold e-cigarette products".
Most experts agree the aerosol in e-cigarettes is less harmful than traditional cigarette smoke because it does not contain most of the cancer-causing byproducts of burning tobacco. The products have been used in the USA for more than a decade and are generally considered safer than traditional cigarettes because they don't create all the cancer-causing byproducts of burning tobacco. But there is virtually no research on the long-term effects of the vaping chemicals, some of which are toxic.