What data do you have on the air treatment systems being normal to poor quality? I would have assumed the opposite - many casinos are trying to cater to smokers

What data do you have on the air treatment systems being normal to poor quality? I would have assumed the opposite - many casinos are trying to cater to smokers and nonsmokers (in the same way they're trying to make Vegas a family and party town) and have massive air treatment to pull the smoke from the air so the casinos don't stink