Do Juul Pods Contain Formaldehyde Tobacco Tuesday Tip One Juul pod = 20 cigs. Some vapes = over 200. That's a lot of nicotine. Think before you puff. This school year, Clinical Studies Juul Labs Science 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. FDA orders Juul to stop selling e cigarette products