Juul Labs Inc. plans to present to federal regulators a new version of its vaporizer designed to unlock only for users at least 21 years old as part of an application the controversial e-cigarette maker must file to keep its products in the U.S. market, according to people familiar with the matter.
All manufacturers must submit their vaping products for Food and Drug Administration review by May 12 to continue selling them in the U.S. after that date. The companies must demonstrate that their e-cigarettes present a net benefit…