Regarding the character with lung disease - it's described similarly to emphysema, and runs a similar course, though I never actually say *what* it is - he lives in an area/cultural context where the smell of incense is ubiquitous. Making matters worse, he lives within a religious organization - there are lots of incense offerings. He is the head of this organization, but I don't think he'd make everyone change everything just for him.
And very few households in this culture are terribly *clean*; dust is ubiquitous and there is often some mold/mildew.
Is his wife going to have to stop using the scented balm she likes?
How much is this going to shorten his life expectancy, make him miserable, et cetera? Or does this vary from patient to patient? How much is my guy likely to just swallow his misery and try to be stoic?