re: #18 Welcome to The Imbleachment (dangerman)

everyone breathes some of ‘their own’ co2
co2 does not cause brain damage
if you were conscious the entire day, then you did not breathe in ‘too much’ co2

these people really dont understand the most basic science.

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CO2 inhalation from a mask is a valid concern - if you are doing intense cardio like running, biking, lots of heavy lifting, etc. Anything that gets your breathing rate up. If you’re just walking and working a light workload, a mask isn’t going to cause any harm.