The air is apparently much healthier that way.
I’m always trying to remind myself this while mouthbreathing slack jawed staring at my computer for too long.
My goal is to be the happiest old man I can be, and thinking this way also makes me take better care of my body. If I have to make a tough decision, I ask myself what will be a cooler story to tell grandkids, and that seems to steer me in the right direction.