Many "experts" say wearing a face mask doesn't decrease oxygen intake, but…

https://7news.com.au/lifestyle/health-wellbeing/two-schoolboys-collapse-and-die-just-six-days-apart-in-china-while-wearing-face-masks-c-1017871

…listening to the wrong experts can be fatal

https://jennifermargulis.net/wearing-mask-can-harm-your-health/