When I joined up in 1981 Washington state had just implemented a law banning facial hair based on interfering with the mask seal. A number of the, then (at least to me), old-timers swore that they never smelled smoke with a mask on until after they shaved off their beards. This was back before fit testing and it was one size fits all, even if it didn't.
"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." – Thomas Sowell