Once again a question about diacetyl :)

[EddieAdams]

The condition or illness caused by smoking is Obliterative Bronchiolitis. I almost lost my father this year due to it and YES it is caused by smoking and Emphysema from it.

Constrictive (obliterative) bronchiolitis: diagnosis, etiology, and a critical review of the literature. - PubMed - NCBI

Constrictive bronchiolitis (CB) (or obliterative bronchiolitis) designates inflammation and fibrosis occurring predominantly in the walls and contiguous tissues of membranous and respiratory bronchioles, with resultant narrowing of their lumens. It differs from bronchiolitis obliterans-organizing pneumonia in its histopathology and clinical course.

FDA BOC

 

[SteveS45]

It is holes in your lungs causing them to collapse.

 

[AzPlumber]

Bronchiolitis obliterans
Not to be confused with Bronchiolitis obliterans organizing pneumonia.
Bronchiolitis obliterans (BO), also called obliterative bronchiolitis (OB) and constrictive bronchiolitis (CB),

Bronchiolitis obliterans organizing pneumonia
Not to be confused with Bronchiolitis obliterans.
Bronchiolitis obliterans organizing pneumonia (BOOP), also known as cryptogenic organizing pneumonia,
Some authors have recommended the use of an alternate name, cryptogenic organizing pneumonia (COP), to reduce confusion with bronchiolitis obliterans, a distinct and unrelated disease.

 

[retired1]

 

[AzPlumber]

I guess we differ on when the horse is dead.