I only wear a mask when strictly necessary. People with asthma like me are officially exempt, but we have to prove we are exempt everywhere by showing our meds and private medical data. I won't do that for a store clerk or someone else I can't trust with my details, and a lot of people like me are still refused because we look too young to be ill
So in order to avoid discussions and problems, I wear my mask even though it makes my asthma symptoms worse. I just don't go anywhere I need them very often, my husband does most of the required shopping and other occasions where we need a mask.
I don't particularly like the idea of a vaccine passport, but I'll be happy when I can use that to avoid discussions.