This is why I had to quit working in 2020.
A mask forces you to rebreathe your own exhaled carbon dioxide, which can cause your oxygen saturation levels to drop to dangerous levels. It's called hypercarbia or hypercapnia. The moment I put a mask on, my oxygen saturation levels DROP below 85%. Any level BELOW 90% can put you into Cardiac Arrest.

This so-called doctor doesn't understand that unless you suffer from respiratory or cardiology issues, chances are that you won't suffer any distress, but if you have COPD, asthma, any other respiratory illness or heart issues, your chances are quite high. Obese people are also at risk. That's the science. Anything less than 90% can put me into cardiac arrest. If you suffer from any of the above illnesses, you are putting yourself at risk if you follow Mask Mandates. DO NOT COMPLY!