CDC: Hartsfield-Jackson is one of seven large airports that allow indoor smoking

Out of 29 airports studied, the seven that allow indoor smoking include Atlanta's airport, Dallas/Fort Worth, Denver, Las Vegas McCarran, Charlotte Douglas, Washington Dulles and Salt Lake City.

Those airports make up about 22 percent of U.S. passenger boardings, the CDC said. The CDC last conducted a study of airport smoking policies back in 2002, and said there are now more airports that prohibit smoking.

Hartsfield-Jackson allows customers to light up in smoking areas and lounges on its concourses, but otherwise generally does not allow smoking in indoor public airport areas.

The CDC cited a Surgeon General's report that said separating smokers from non-smokers cannot eliminate exposure to secondhand smoke. The agency also cited studies showing that about 46 million American adults smoke.

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