Denver International Airport, and its smoking lounge in Concourse C, has landed on a list of smokey airports on government health watch list.

The Centers for Disease Control and Prevention Friday released its "Smoke-Free Policies in the World’s 50 Busiest Airports," with 14 of North America's 18 major airports credited with having a "smoke-free" policy.

DIA isn't one of them: The airport still has the Timberline smoking lounge, operated by Smokin’ Bear LLC on Concourse C.

Three other DIA smoking lounges have closed and the Timberline is expected to close when its lease expires in 2018.

"Airports were considered to have a smoke-free policy if they completely prohibit smoking in all indoor areas. Airports were considered to have no smoke-free policy if they allowed smoking in any indoor areas, including designated or ventilated indoor smoking areas," the CDC said in its report, adding "smoke-free policies substantially improve indoor air quality and reduce secondhand smoke exposure among nonsmokers. The 2006 Surgeon General’s report concluded that eliminating smoking in indoor spaces fully protects nonsmokers from exposure to secondhand smoke, and that separating smokers from nonsmokers, cleaning the air, and ventilating buildings cannot eliminate exposure of nonsmokers to secondhand smoke."

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