CHICAGO, Ill—Just like traditional tobacco smokers, electronic cigarette smokers in Chicago must now take their habit outside. The Chicago City Council moved to ban the smoking of electronic cigarettes, or e-cigarettes, in most indoor public spaces on Wednesday. Backed by Chicago Mayor Rahm Emanuel, the ordinance also prevents Chicago residents from smoking e-cigarettes within 15 feet of public entrances.

City Council voted 45-4 on the ordinance, supporting Emanuel’s initiative to limit e-cigarettes and related products from affecting minors. Retail shops and tobacco stores must also be more discreet in the dealing of e-cigarettes in an attempt to prevent minors from purchasing the popular cigarette alternative. This ordinance aids the Illinois law that came into affect Jan. 1, which bans the sale of e-cigarettes to minors.

According to a study from the Centers for Disease Control and Prevention, almost 1.8 million minors have tried e-cigarettes at least once. The study also reports that the number of e-cigarette users in U.S. junior highs and high schools have doubled from 2011 to 2012.

“I do not think we should wait on the FDA,” Mayor Emanuel stated after the ordinance was passed. Emanuel’s administration aims to support the state’s Smoke Free Illinois Act with the new ban.