BREAKTHROUGH NEWS: Doctors just announced that vaping has been conclusively linked to permanent lung disease. Sadly, many teens have already been diagnosed. Diacetyl, or 2,3 butanedione, is a flavouring agent that becomes a Do Juul Pods Have Diacetyl How To Use Juul Pods Do Crystal Bar Vapes Have Diacetyl? Diacetyl Vape Is Diacetyl in Vape Juice 2021 ? 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. Understanding Diacetyl in Vaping Products