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Breathing through the nose has many benefits. Breathing through the mouth, many negatives. There are some researchers who believe that mouth breathing and associated hyperventilation causes or exacerbates asthma, high blood pressure, heart disease, and many other medical problems. Always better whenever possible (deviated septum and small nostrils may make it impractical but still nose breathing 24 hours a day is extremely important for those who desire the longest and most healthy life.
Originally posted by Zosynspiracy
Oh brother while I agree with what's being said I think people nowadays have a lot more important things to worry about when it comes to their health. Mouth breathing is hardly going to be the death of anyone when cancer is one the rise, diabetes, etc. and people are eating like crap, more stressed out, and getting less and less exercise.