If you are a parent, pay close attention, there are vaping devices small enough for school kids are taking them to school [...] "They're easy to hide, they look like a flash drive but they're a vaping device, the most popular called a Juul pen, which is normally filled with liquid nicotine," DEA Agent Wendell Campbell said. "But kids are misusing it, filling it with marijuana extract to get a secret high many times while in school."

THC, or tetrahydrocannabinol, is the main chemical responsible for most of marijuana's psychological effects.