Listen to the experts:
Chris Schaefer is a respirator specialist with 28 years in occupational health and safety,... He explained that in the field of occupational health there were no studies or impact assessments done on the use of the current crop of so-called “masks”. He warns that these barriers force us to breathe in bacteria and fungi, from the moist and warm environment created under the barrier. There are also hazards to wearing N95 devices, because of the particles that are released and inhaled during prolonged use. He addresses the panel of the Citizens' Hearing https://citizenshearing.ca/day-1-videos-13-16/#chris
or read the entire summary here: https://zeroanthropology.net/2022/06/27/day-1-of-a-citizens-hearing-examining-canadas-covid-response/ (He is the 13th speaker.)
See also: https://unmaskourkids.com/wp-content/uploads/2021/05/Chris-Schaefer-Mask-Brochure.pdf
As well as https://followingthecovidscience.8b.io/page29.html
And breathe easy!