CDC says:
"
...using an FFR for an extended period may cause dizziness (as well as other symptoms), which could compromise the worker, workplace, and patient safety. Dizziness is an important warning sign, as it can be caused by dehydration, hyperventilation (gasping for breath), elevated carbon dioxide [CO2] levels in the blood, low blood sugar, and anxiety, among other things."
Provides easy-to-read workplace safety and health information on a variety of topics.
blogs.cdc.gov
Wear one if you want. I don't need one.
If the masks work, you're protected. If they don't work, you can't possibly make someone else wear one.
PS: Clearly they don't work. Double-masked and boosted Fauci, Biden, HHS Secretary Becerra, CDC Director Walensky all got COVID more then once.