In the movies: Masks on a plane!
A no brainer, imho, but the added methodological broadside may help the one or the other sceptic to come around.
Personally, over here I look inside a shop or supermarket whether there are few or many people inside, and depending on what I see I use a mask or not. Means: I do not wear a mask in EVERY shop situation anymore. Small shop: mask; big shop: not always. Many people: mask; few people: maybe no mask. No air ventilation: always a mask.
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If you feel nuts, consult an expert.
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