Standing behind the counter of a Midtown Kansas City vape shop, Billy Angus pondered the gravity of a new directive from Washington, D.C., aimed at an increasingly popular alternative to cigarettes: “It’s going to cause most of the industry to go out of business,” said Angus, manager of 816 Vapor, which sits along 39th Street. Electronic cigarettes are among a class of products known as electronic nicotine delivery systems (ENDS). They are typically composed of a simple battery and an atomizer-- a self-contained heating element. The atomizer heats a flavored liquid, or “juice,” that contains nicotine, producing vapor instead of smoke. Dissenting views about the regulation’s impact come from public health advocates, including the head of the University of Kansas Cancer Center, and from the federal Department of Health and Human Services, which issued the rule through the Food and Drug Administration. In announcing the new regulation in May, HHS Secretary Sylvia Burwell called the move “an important step in the fight for a tobacco-free generation” and said it would “help us catch up with changes in the marketplace, put into place rules that protect our kids and give adults information they need to make informed decisions.” According to the FDA ,16 percent of high school and 5.3 percent of middle school students were current users of e-cigarettes in 2015, making e-cigarettes the most commonly used tobacco product among youth for the second consecutive year. The new rule, which took effect Monday, extends the FDA’s authority over tobacco products to include ENDS. The regulation implements the 2009 Family Smoking Prevention…...