I don't ever cough unless I have to wear a mask, the reason being that the mask interferes with my breathing because I only have one nostril which works, therefore, unless I am in an environment which states that I have to wear a mask, I don't wear one.
In effect, by not wearing one, I seem to be less of a danger to others because I am not coughing out any germs or anything at all.
I think that I should join confused.com ---perhaps they will tell whether masks are the answer or not.

sinkov --just read your post you forgot to add ----hang it round your chin!