To be clear, the CDC has not yet confirmed whether patients' lung conditions are actually caused by vaping. Case investigators have not even found a common link other than the fact that patients change. Some have admitted to using tetrahydrocannabinol or THC, which causes "high" marijuana, and the president of the American Vaping Association, Gregory Conley, is convinced that the disease is caused by devices containing cannabis.
CDC official Iliana Arias, however, said that "[m] ore information is needed to know what causes these diseases." Authorities are investigating several theories, including the possibility that diseases are caused by toxic substances such as heavy metals. such as lead or specific flavors. Ultimately, doctors with lung injuries are consistent with chemical inhalation injuries, and the FDA has no control over the ingredients used by manufacturers.
FDA Director of Tobacco Products Center Mitch Zeller said the agency is already testing products to determine if they contain harmful substances. Its discoveries would only be useful if the diseases were indeed triggered by substances in commercial products. See, another theory is that people empty commercial nicotine pods and fill them with proprietary mixtures containing various chemicals, including THC oil.
Zeller said that various government agencies are already using a lot of resources to investigate the problem, seeing as it seems to be increasing over the days. The number of cases has doubled in the last week and patients show extensive, even permanent, lung damage requiring ventilator days. Before their condition becomes so serious, patients report a gradual onset of symptoms that include difficulty breathing, vomiting, nausea, chest pain and fatigue.