Al Hradecky held the attention of fifth-grade students as they sat cross-legged on the floor in the auditorium at Balboa Elementary School, and they heard information about a rising trend — vaping. “How many of you know people who smoke cigarettes?” Hradecky asked. More than half of the students raised their hands. Hradecky owns Impact Canine Solutions, a company specializing in dog drug-detection services for schools, businesses and juvenile detention centers. Three years ago, Hradecky started offering drug-prevention presentations, and he tailored them to 10-year-olds, delving into vaping. He broke down how vape pens work, their ingredients, their effects and how they compare to cigarettes. He said one Juul vape pod equals a pack of cigarettes, and a person, on average, consumes one or two pods a day. Although addiction to nicotine is declining in this classroom’s age bracket, teens are rapidly embracing electronic cigarettes. “I live in this community, and I feel like it’s an epidemic with our youth,” said Sona Arakelyan, Balboa Elementary’s principal. “Even though I have not seen [vaping] incidents at Balboa, our kids ask about it.” She added, “I know they’re wondering what...