farmer’s lung

noun, an inflammation resulting from sensitization of the immune system to mould spores present esp. in damp hay (“farmer, n.2.” OED)

“I got farmer’s lung, they call it — the doctors call it asthma — first year when I helped with the thrashing gang. I had to go in the mow … I was spitting dust for two weeks!”

“Everybody that farmed years ago probably has farmer’s lung.”