In one focus group cited in industry documents, smokers said tossing their butts to the ground was a natural extension of the defiant/rebellious smoking ritual. Their efforts anti-litter campaigns and handheld and permanent ashtrays did not substantially affect smokers' entrenched butt flicking behaviors, said a research paper co-authored by Novotny
The other stores in town got together
In practical terms, this means its excellent at removing visible smoke particles (the stuff that makes the air look hazy and triggers your fire alarm), but its far less effective at removing the gaseous VOCs that create persistent odor and long-term health concerns
in biochemistry, but were each geniuses in our own right
From a health standpoint: the differences are minimal
Also, in one point a gangster is shown peering down from a rooftop next to an enormous electrical sign, flashing on and off