Vapes on black market may contain toxic chemicals, pesticides, harmful flavorings Conventional and multi omics assessments of subacute inhalation toxicity due to propylene glycol and vegetable glycerin aerosol produced by electronic cigarettes ScienceDirect The Impact of E Cigarettes on the Lung Providers AmeriHealth Caritas Pennsylvania E cigarettes can emit formaldehyde at high levels under conditions that have been reported to be non averse to users Scientific Reports