Popcorn Lung Symptoms: Early Signs, Causes, Diagnosis
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TL;DR: Popcorn lung (bronchiolitis obliterans) scars and narrows the lungs' smallest airways, causing a persistent dry cough and breathlessness that typically begin 2–8 weeks after a big exposure (vape chemicals, toxic fumes, certain illnesses). It is rare but serious and usually doesn’t respond well to quick‑