Do Juul Pods Contain Formaldehyde FDA orders Juul e cigarettes off the market over safety concerns Do Juul Pods Contain Formaldehyde Juul users inhaling chemicals not listed Clinical Studies Juul Labs Science The Medical Minute: Hazards of juuling or vaping Penn State University FDA orders Juul to stop selling e cigarette products DYK? Vaping coats lungs with potentially harmful chemicals. This can include chemicals such as: Diacetyl: This food additive, used to deepen e cigarette flavors, is known to damage small passageways in the lungs.