According to recent observations and research from University of California just published in The Conversation:
In places where most people wore masks, those who did get infected seemed dramatically less likely to get severely ill compared to places with less mask-wearing.
It seems people get less sick if they wear a mask.
When you wear a mask – even a cloth mask – you typically are exposed to a lower dose of the coronavirus than if you didn’t. Both recent experiments in animal models using coronavirus and nearly a hundred years of viral research show that lower viral doses usually means less severe disease.
No mask is perfect, and wearing one might not prevent you from getting infected. But it might be the difference between a case of COVID-19 that sends you to the hospital and a case so mild you don’t even realize you’re infected...
This is consistent with the lower critical cases and death rates observed in countries where masks have been adopted widely. All other Asia, we have seen lower death rates and lower number of critical cases. This may be linked to wider use of masks, among other factors.
This is one more reason to wear a mask, any mask, on a regular basis.