For sure. My point is that my B-I-L didn't know that he had it, because no-one looked for it.
Obviously we all knew people who had died from it, and we knew it was an issue with rail carriages and with all kinds of domestic settings: garages and the like.
In his case, it killed him, prematurely, in his early 70's. But for most, it's an undiagnosed condition that doesn't actually prematurely kill
Like the prostate cancer that half of we men will die with, but not from. One may have it, but it's not necessarily harmful or life-shortening.