We had a guy in my work doing some work (I work in a vets) asked him to put a mask on and he said he couldn’t as he had asthma, wish I could of shown him the video that proves it has absolutely no effect on you being able to breath.
We all wear masks our full shift to keep or clients and each other safe. We do not allow pet owners in the building if they aren’t/don’t want to wear a mask.