Topeka ? Topeka officials plan to consider banning electronic cigarettes in enclosed public places.

The e-cigarettes, which allow nicotine users to inhale vapor, have become increasingly popular substitutes for tobacco cigarettes.

But Topeka City Councilwoman Elaine Schwartz says questions remain about the safety of e-cigarettes. She is proposing expanding Topeka’s smoking ban in most enclosed buildings to include e-cigarettes. Currently, building owners can decide whether to allow the e-cigarettes. The proposal would include an exception for retail smoke shops that sell the e-cigarettes.

The council will consider the proposal on Tuesday.

The Topeka Capital-Journal reports that Overland Park, Olathe, McPherson and Kansas City, Kansas, already ban the use of e-cigarettes in some public places.