The debate on the effectiveness of wearing mask has been on going for 15 plus years , in Asia its seen as a normal thing , some wear them in large polluted cities or on crowded public transportation .

Many renowned scientists have claimed there is no evidence to suggest their effectiveness.

I do wonder if they are a form of psychological comfort blanket ?

You could argue though if a person had a flu type virus that may contain it , if it the right mask .??

Who knows , neither experts, the Trump , or you and I don't.

My gut feeling , if asks worked there would be evidence of less flu type viruses in Asia where they have always been worn , and thats appears not to be the case .