Which herbs instead of salt or silver colloids for lungs

I do like natural ways to prevent or heal body and mind. In studies I made I discovered that silver colloids or salt particles
inhaled are very good against lung issues (all of them). Easier breathing after inhaling one of these substances is one of the main effects. It is well known to use in humans and horses too. I wonder now which herbs could be used instead of inhaling silver colloids or salt particles. Anyone?