Do Juul Pods Have Diacetyl FDA warns Juul, says it marketed vapes as less harmful than 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. Students and Vaping Why Teens Vape and JUUL Health Risks Health concerns surrounded vaping long before recent deaths Anchorage Daily News