(AP) — A proposal to ban minors from using e-cigarettes has sparked a debate in the Nebraska Legislature.

Lawmakers began debate Monday on a measure that would ban minors from using e-cigarettes and stores from selling them to anyone under 18. Senators broke away for lunch before taking a vote.

Sen. Russ Karpisek of Wilber, who introduced the legislation, says there hasn’t been enough study to know if e-cigarettes are safe.

Sen. Jerry Johnson of Wahoo tried and failed to change the legislation so that the product wouldn’t have to be behind a counter or in a secure display case. He says if the e-cigarettes can help people break a smoking habit, they should have better visibility.