Study shows wearing masks makes you stupid (er)... Cognitive Deterioration
(gellerreport.com)
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Correct. Breathing CO2 is not itself dangerous (not poisonous) - the fact that it is decreasing the O2 level is the actual problem.
Many studies have been done for submarine crews and space crews regarding O2 vs CO2 levels... what is safe, and what is dangerous.
Besides the O2 issue is the fact that people are inhaling all sorts of bacteria, etc. that the their lungs had worked so hard to get rid of...