[rumanator]

> it seems pretty likely that most of the smoke will be caught

If your plan is to only block most of the virus then perhaps you should rethink it.

It's like stating that a hole in the hull is not a problem because the rest of the ship keeps most of the water out.

[ImprovedSilence]

Actually initial viral load seems to be a factor in how severe the disease gets. So keeping any percentage more out of you that you can helps..

[jnbiche]

This is potentially misleading. Viral load is a significant factor in the seriousness of most infectious diseases. This is why you'll likely be ok if you pass a coughing TB patient in the street and inhale a few bacteria, but are much more prone to contract TB if you spend an entire day cooped up in a small room with the same coughing, infected individual.

This is thought to be why an unexpectedly high proportion of young, healthy doctors and nurses are getting seriously ill from Covid-19. Statically, you'd expect almost all of them to get mild disease.