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What causes popcorn lung?

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The chemical that gave this condition its nickname is diacetyl. After workers at a factory that packaged microwave popcorn were found to have bronchiolitis obliterans more often than other people, some companies stopped using diacetyl as a flavoring. But it's still used in some electronic cigarette flavors in the US. Many e-cigarette makers state they aren't using this chemical in their products and its use in e-cigarettes is banned in Europe.

From: What Is Popcorn Lung? WebMD Medical Reference

SOURCES: 

NIH Genetic and Rare Diseases Information Center: "Bronchiolitis obliterans."

American Lung Association: "Popcorn Lung: A Dangerous Risk of Flavored E-Cigarettes."

National Institute of Occupational Safety and Health: "Flavorings-Related Lung Disease."

National Jewish Health: "Bronchiolitis Obliterans."

Toxicology Reports: "Pathology, toxicology, and latency of irritant gases known to cause bronchiolitis obliterans disease: Does diacetyl fit the pattern?"

EnvironmentalHealth Perspectives : "Flavoring Chemicals in E-Cigarettes: Diacetyl, 2,3-Pentanedione, and Acetoin in a Sample of 51 Products, Including Fruit-, Candy-, and Cocktail-Flavored E-Cigarettes."

Environmental Protection Agency: "Sulfur Dioxide."

Seminars in Respiratory and Critical Care Medicine: "Occupational and Environmental Bronchiolar Disorders."

Seminars in Respiratory and Critical Care Medicine: "Bronchiolitis Obliterans Syndrome -- The Achilles' Heel of Lung Transplantation."

Johns Hopkins Arthritis Center: "Rheumatoid Lung Disease."

Reviewed by Louise Chang on April 21, 2019

SOURCES: 

NIH Genetic and Rare Diseases Information Center: "Bronchiolitis obliterans."

American Lung Association: "Popcorn Lung: A Dangerous Risk of Flavored E-Cigarettes."

National Institute of Occupational Safety and Health: "Flavorings-Related Lung Disease."

National Jewish Health: "Bronchiolitis Obliterans."

Toxicology Reports: "Pathology, toxicology, and latency of irritant gases known to cause bronchiolitis obliterans disease: Does diacetyl fit the pattern?"

EnvironmentalHealth Perspectives : "Flavoring Chemicals in E-Cigarettes: Diacetyl, 2,3-Pentanedione, and Acetoin in a Sample of 51 Products, Including Fruit-, Candy-, and Cocktail-Flavored E-Cigarettes."

Environmental Protection Agency: "Sulfur Dioxide."

Seminars in Respiratory and Critical Care Medicine: "Occupational and Environmental Bronchiolar Disorders."

Seminars in Respiratory and Critical Care Medicine: "Bronchiolitis Obliterans Syndrome -- The Achilles' Heel of Lung Transplantation."

Johns Hopkins Arthritis Center: "Rheumatoid Lung Disease."

Reviewed by Louise Chang on April 21, 2019

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What is another common cause of popcorn lung?

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