People have theorized that it spreads through respiratory droplets. People who blithely claim that to be true, are repeating a guess as if it were truth.

Now we know that it probably aerosolizes, and this explains why it preferentially spreads to tall people - because droplets sink, and vapors do not sink as fast. We do not yet know the breakdown of risk in the different modes of infection.

We have also known, for a long time, that masks become wet, and may worsen the spread. In fact, this is why the CDC previously recommended against wearing a mask. All of this only impacts people who are already sick, and it's not clear that asymptomatic spread is significant.

The evidence from one region, also stands in stark contrast to numerous other regions whose known infection trends, do not correlate to one or both of masks or lock-downs. The overall pattern is one of neither masks nor lock-downs consistently altering the spread. The only unambiguous correlation is habitation density, which is not affected by either of those measures.

But hey, I won't stop you from wearing one if you want to.