Breathing through the nose increases nitric oxide in the body. Nitric oxide is:
- a bronchodilator which increases airflow in the lungs
- an antibacterial agent that helps neutralize germs and bacteria
- a vasodilator which enhances blood flow in the body and to the extremities.
For more information on nose breathing see: http://articles.mercola.com/sites/articles/archive/2013/11/24/buteyko-breathing-method.aspx