When I was in a private Catholic girl's HS, our priest was also priest at the local TB Sanitarium. He took us all over there to see the exhibits...real lungs, some from smokers and some from non-smokers.
Extremely convincing. Smokers have dark gray or black lungs and the little air pocket collapse. Even when I did smoke, I didn't smoke very much.
My father back in Ireland had TB at the age of 19 and spent a year at a TB Sanitarium “coughing his way into eternity”.
His big complaint was no one in the family went to visit him.