Causes of popcorn lung condition: Medically called Bronchiolitis Obliterans, it is a rare but severe respiratory condition where the smallest airways in the lungs become inflamed and scarred. The condition is said to be irreversible, and vaping, especially those containing diacetyl and other harmful chemicals, has been linked to its development (Image: Canva) Health and respiratory problems related to lungs can come in many forms. The latest one that has come to light is popcorn lungs.