Here's my spin:
Do not go to campgrounds with fire rings, or camp away from them.
Go to place that do not allow fires ny state ct and some others.
encourage the use of stoves, besides, unless the wood is brought in the place is usually picked clean.
stealth camp with a hammock. (okay it's the best I can offer)
Is it really stealth camping if you just stay away from other sites using a fire?
find a doctor that's willing to work with you for a filter mask.