You are breathing dust fungus and and all type of things 24/7
It seems to me that what you really need is to get your health up first.
If you are healthy those things cant get to you but if you are weak they will.
Restore the health of your lungs first, do lots of breathing exercises and stretches.
Consult a doctor in Chinese medicine.
And for the moment until you get better don't inhale any type of smoke or vap.
Your body is telling you something listen to it.
My two cents.