As electronic cigarettes and other vaping devices grow in popularity, there is also increased scrutiny of the potential health effects of the devices. While there’s no evidence yet of any health issues associated with their use, a state lawmaker wants them included in the state’s workplace smoking ban.

The bill comes from state Representative Debra Kolste (D-Janesville), who says she’s concerned about the rapidly growing use of the products in public, when so little is known about their long-term health effects. She points to at least one study which found formaldehyde was an ingredient in an e-cigarette product.

Proponents of the devices argue that users only breathe out a harmless vapor and that they should not be included in the same category as traditional tobacco products. Kolste maintains that the vapor is still going into the air though, and others may breathe it in.

Some communities have already moved on their own to ban e-cig use in public places and businesses. Republicans have also introduced legislation that would prevent local governments from banning the devices in private businesses.