How it may have started
"People once believed that spirits of the dead could enter through the nose and mouth" says folklorist Elizabeth Tucker.
Why its Nonsense
The dead cant enter through your nose or mouth but livings do, though almost all are harmless. "Kids in hale around are 30,000 times a day" says pulmonologist Daniel Culver, and expert on the respiratory system.
"Every day, you breathe i hundreds of millions of bacteria and fungi". Most wont hurt you, and if dangerous bacteria do enter your lungs your body is usually able to fight them off.
National Geographic Magazine
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