So, according to this study (Respirable Particles and Carcinogens in the Air of Delaware Hospitality Venues Before and After a Smoking Ban), Delaware's ban on smoking in indoor public spaces has worked:
This air-quality survey demonstrates conclusively that the health of hospitality workers and patrons is endangered by tobacco smoke pollution. Smoke-free workplace laws eliminate that hazard and provide health protection impossible to achieve through ventilation or air cleaning.
We sort of already knew this, but it's nice to have scientific back-up!
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