Considering exhaled smoke is just breath with also burnt plant material and byproduct, that's not too surprising. It's more like 'cigarette and marijuana smoke makes visible the cone of particulates of general exhalation through which contagious respiratory illness is largely spread.'
Covid may possibly be spreading via cigarette and marijuana smoke, so that's neat.
Considering exhaled smoke is just breath with also burnt plant material and byproduct, that's not too surprising. It's more like 'cigarette and marijuana smoke makes visible the cone of particulates of general exhalation through which contagious respiratory illness is largely spread.'