For years I blamed a persistent cough on fumes from painting in oils. This summer a friend alerted me to the dangers of mouth breathing. He was resorting to taping his mouth at night to stop his habit. My cough is all but gone as I remind myself to shut my mouth as I walk and gawp at trees!
We need incoming air to be filtered by the nose for our good health just as we need trees to filter air for the well-being of the planet.
Are you a mouth breather?
Breath by James Nestor. Lots fo videos on the internet and a book.