“Masks are incredibly harmful because they lower oxygen levels in the blood (leading to hypoxia) while raising carbon dioxide levels (leading to hypercapnia), and force you to inhale and exhale more forcefully, stressing the cardio-pulmonary system.”
Absolutely false for most people. I have asthma and have measured my own oxygen saturation with an FDA approved pulse oximeter while wearing a mask. In fact I did it again just before writing this comment, My oxygen saturation is consistently 97% to 98% whether I wear a mask or not.
Stop promoting this dangerous disinformation.