And, from the article - it really should at the very least, be an act of courtesy....if a person is unwell in public eg at the GP's clinic.
"So wearing a mask may well be “an altruistic act that helps prevent you contaminating your environment,” says clinical researcher Meg Jardine of The George Institute for Global Health."
I was following a discussion between my nephew (anaesthetist) and various friends the other week and he was explaining that an individual wearing a mask for their own protection can actually be counterproductive in that it increases the risk of transmission of the virus to them from uncovered carriers of the virus. The mask can become a reservoir of collected matter including the virus over the day and it is incorrect doffing procedure that can result in the virus being transmitted from the mask. Who of us would have thought that there was a correct way to take a mask off?