From what I have seen it appears to be mostly 2 with perhaps a bit of 1. There may be no evidence of wearing masks causing harm to the wearer, but there is amp

From what I have seen it appears to be mostly 2 with perhaps a bit of 1. There may be no evidence of wearing masks causing harm to the wearer, but there is ample evidence of excessive demand for masks leading to health workers not having adequate protection. That, along with "no evidence of masks preventing infection in the general public" is enough, I think, to justify the current expert opinion. I would not normally be wearing a mask outside at the moment because there is no compelling medical reason, as far as I can see. As long as you maintain distance and wash hands, etc. However, I do wear a mask outside because I live in a country where an unmasked foreigner causes "concern" to some. So I mask up for social reasons.