I think he means the cigarette smoke.
Nevada you can smoke anywhere. And a lot of them do, some locals, but also tourists from other states.
And no matter what the ventilation system, that smoke stinks.
I can smell someone sucking on one of those things from about 1/2 mile away.
Or if I go into a motel room where they were smoking, it stinks.
Even some of the smokers are bothered by it, and only smoke outside, or not in their car, etc.