The world’s busiest airport is making a dramatic change sure to affect thousands of customers.

Atlanta’s Hartsfield-Jackson International Airport, which has been the world’s most-trafficked airport in terms of passengers since 2000, went smoke-free starting Thursday, Jan. 2.

“In an effort to maintain the health, safety and welfare of the traveling public the City of Atlanta has passed an ordinance prohibiting smoking and vaping inside Hartsfield-Jackson Atlanta International Airport (ref. no, 19-O-1205),” the city of Atlanta said in a statement. “In accordance with this smoking ban, all smoking rooms inside the airport will close on January 2, 2020.”