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" ... Our noses aren’t put on our faces simply to look cute. They really are meant for breathing. The front part of the nose, with mucus and tiny hairs, helps filter out the contaminants in the air we breathe, it humidifies the dry air, and warms it to body temperature before it makes its way to our lungs. The nasal airway is the most efficient, effective greenhouse there is. When you breathe through your mouth (try it right now), the dry air gets to your lungs all right, but there is no filtering, not much warming, and no humidification before the air hits our windpipe (trachea) to our lungs. It is not ideal. ... "