Yeah do a combination of what many others here are suggesting - your company needs to provide the actual ppe for it's employees - politely point out the disclaimer on the box that theses masks do not provide adequate protection , if the business wants you to wear an effective mask they need to then provide (a more expensive) filtered mask - when anyone talks to you continually speak soft/ mumble so they are constantly repeating 'say again', throughout the following days after already casually pointing out you 'feel short of breath wearing them for any length of time' - feign slight breathlessness/ dizziness - then one afternoon just fcking collapse in the cafeteria or wherever onto a table or bench top ( make a big mess -drop the coffee jar whatever, lol) but make sure to crack your head - like literally and purposely bang your face/ head - bloodied nose / black eye/ lump on the forehead etc ( get some decent 'injuries') - all the better - go doctor -headaches / slight concussion etc etc - couple of days off to recover. Come back to work rinse and repeat..... Play the long game.