BUMP to your post at #118.
I regularly ask employees in stores how it is to have to wear one for a shift every day. People are forced to wear masks to work in order to keep their job. I constantly hear of complaints of shortness of breath, extra exertion, increased headaches and rashes or severe acne forming around the bottoms of their face.
Their bodies and lung system are designed to reject the use of contant blocking of fresh air flow and breathing in their own exhaust.
“Too Much Carbon Dioxide Is Toxic”
“...However, if you breathe high concentrations of carbon dioxide or re-breathe air (such as from a plastic bag or tent), you may be at risk for carbon dioxide intoxication or even carbon dioxide poisoning. Carbon dioxide intoxication and carbon dioxide poisoning are independent of oxygen concentration, so you may have enough oxygen present to support life, yet still suffer from the effects of rising carbon dioxide concentration in your blood and tissues.
The condition of excess carbon dioxide concentration in the blood is called hypercapnia or hypercarbia. Symptoms of carbon dioxide toxicity include high blood pressure, flushed skin, headache and twitching muscles. At higher levels, you could experience panic, irregular heartbeat, hallucinations, vomited and potentially unconsciousness or even death.
There are several potential causes of hypercapnia. It may result from hypoventilation, diminished consciousness, lung disease, rebreathing air, or exposure to an environment high in CO2 (e.g., near a volcano or geothermal vent or under in some workplaces). It can also occur when supplemental oxygen is administered to a person with sleep apnea...”
https://www.thoughtco.com/carbon-dioxide-poisonous-607545
Thanks, Flyer, and thanks for the CO2 link, That’s good info as well.