With the help from WebMD we can understand more about this potentially deadly condition

“Popcorn lung” is the nickname for bronchiolitis obliterans. That’s a condition that damages your lungs‘ smallest airways and makes you cough and feel short of breath. It’s sometimes caused by breathing in a chemical used to flavor microwave popcorn. But other chemicals or lung illnesses can also cause popcorn lung.

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https://www.webmd.com/lung/popcorn-lung#1