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Very true. I read a couple of studies a year or so ago about nasal breathing. One finding was that inhaling oxygen through the nose rather than the mouth allows it to move through our respiratory system more efficiently. Additionally, nasal breathing helps produce nitric oxide, which can lower blood pressure, improve blood flow, and neutralize airborne pathogens. However, these studies were either small-scale (with 10 or fewer participants) or hypothesized based on other research that was completed. It'll be interesting to see how the science evolves over time.