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Thank you, @merpreb That really is an interesting article. It's good to know that CO2 is not a problem.
For those of you who do not want to bother going to the link, here is what the article says:
"There is a myth that if u wear a mask, u breathe your own exhaled CO2. Firstly, the space between your face and the mask is 40-50mm. You breathe and exhale about 500ml of air with each breath. Frankly, the 8-10% air that u may RE-breathe with a mask without an exhale valve actually makes your lungs stronger – like a training mask, as seen in the movie Pink. Doctors actually recommend those masks that RE-circulate CO2 to high performing athletes for improved lung function."
The author is Richa Upadhyay, here are her credentials:
Studied at Makhanlal Chaturvedi National University of Journalism and Communication
Lives in Bengaluru, Karnataka, India
So frankly I am not sure what qualifies her to answer the question, but the answer does make sense. I would prefer to see something by someone who had better qualifications though.

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Replies to "Thank you, @merpreb That really is an interesting article. It's good to know that CO2 is..."

@contentandwell– There's also some common sense here too. If we can inhale O2 why can't we exhale Co2? The CO2 is actually smaller. The masks' holes are much much larger than these molecules. If people are fainting or getting dizzy then maybe there are underlying causes. There are way too many myths that need to stop.