The question is not of distance. The question is of permeability. Find a study that addresses what is blatantly obvious in his experiment.
The question is not of distance. The question is of permeability.
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No. The question is do masks curb the infection rate.
But to the question of permeability, it’s obvious the mask is less permeable than no mask as the smoke escapes through the sides. And in all liklihood travels nowhere near the distance it would if there was no mask at all. But the only way to prove that would have been to exhale smoke with no mask.
Which for some reason he doesn’t do. That would have been the standard to judge his experiment by. The greater distance covered by the smoke, the greater the chance of infecting those nearby.