Richard, does more air coming in through the nose guarantee that you will smell more efficiently, or maybe it will decrease the sense of smell. If you try to avoid an odor, by not breathing deeply, it does not help, but if you take a few deep breaths through the nose, you desensitize your nose, and you will not smell the odor anymore. I was taught this by a farmer, while I was trying NOT to smell cow "pies" while walking through a field. Ken B