Besides being required to wear them at work my asthma specialist told me to wear one during flu season but he also explained their faults. He only wanted me to wear one when in crowds. I wore them during the really bad flu seasons but I did so by referring back to my training with the N95. I wore them but never depended on them and never for more than a few minutes at a time.
Health Care workers (at my place) have been wearing them for up to 13 hours straight for going on 18 months now. I have my own pulmonary issues and frankly, it was worth it to me to just walk away a few years early, much sooner than I had long planned.
I am not the only one. Word is that in 6 months my entire old department has been replaced with new younger workers, save a few.