Popcorn lung is caused by breathing in certain harmful chemicals or substances, some of which are found in e-cigarettes. Popcorn lung occurs when bronchioles become scarred and narrow, making it harder for your lungs to get the air they need. The bronchi then split into smaller tubes called bronchioles, which are the smallest airways in your lungs. The trachea then splits into two airways, called bronchi, that each lead to one of your lungs. When you take a breath in, air travels into your airway, also known as your trachea. It can cause scarring and narrowing of these important airways, leading to wheezing, shortness of breath, and coughing. Popcorn lung, or bronchiolitis obliterans, is a disease that affects the smaller airways in your lungs called bronchioles.
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