If you are having to wear one all day and you are full time. Ask your doctor about the effects of long term oxygen deprivation. Then complain about migraines and blurred vision.

Then get others you work with that dont like wearing them to complain aswell. Doing the same thing. Ring doctor. Complain about oxygen deprivation and headaches.

Also saying you are tired all the time since you had to wear a mask.

Use "health and safety" against them. If you or others can fake passing out all the better.