It's a form of blood poisoning. It comes from over exposure to your bodily waste = carbon dioxide. Breathing in ur exhale is the gaseous form of eating your chit. Both are bodily waste and cause sepsis. I've seen posts & videos from parents & very young people in the hospital and near death. We're going to have an epidemic of upper respiratory infection's due to this mask chit & they're going to blame industry + manufacturing + cars + farmers. They will shut everything down & again we'll be enslaved to China. If people are too dumb to know they shouldn't breathe their bodily waste they won't question why everyone is sick. And won't matter. We live in the reality fake news creates. People just want to obey.