I'm in sales. If you have reduced hearing I suppose this could be a problem. I was able to overcome my hearing loss (50% surgical ear, now (and new) sensorineural hearing loss; both ears are problematic). Just got ReSound Linx 3D Hearing Aids, they are great! Not sure I am getting enough ventilation (L ear), may not work for me. I think if you are in an environment with dangerously loud noise, or smoke (casino) this is not a good place for people w/C-tomas to be. Also, if you are surrounded by people constantly sick. It is not good for people with C-tomas to get sick (a daycare, I would think not the best place). This is ONLY my opinion of course.