What everyone should read is why they wear the mask in Asia; especially Japan... for the last 125-years (courtesy to others)... In other words; when you are ill you wear the mask so you do not spread your germs to someone who is not ill.... And this is basically the same reason surgeons and their assistants wear masks during open heart surgery. They do not wear the masks in order to not catch heart disease -- they wear it so their germs do not fall into an open body... Very simple and elementary. 😷