> Doubtful it's good to have such durable micro materials bouncing around our lungs and digestive tracts.
Having odd things in your lungs is bad. Having things bouncing around in your digestive tract means nothing. The whole point of the digestive tract is that you put untrusted materials into it.
Uh, smoke particles and mineral dusts are generally non digestible - and we’ve been eating smoked/cooked meats and slightly dirty things for at least as long as recorded history?
