The days of teens sneaking cigarettes in the school bathroom are slowly going away, but they are being replaced by another trend that is alarming both parents and school authorities. Teens are taking to vaping more and more, seeing it as the cool alternative to smoking, but with so little research on the health effects of vaping on young minds and bodies, people are justifiably concerned about this development.

Make no mistake about it, teens are increasingly using e-cigarettes and other devices that head liquid into a vapor that can be inhaled. They often come in sweet, kid-friendly flavors like watermelon or mint, to name a few. And because vaping uses nicotine, the addictive drug in cigarettes, teens may get hooked at a very young age.

And vaping devices are becoming more and more compact, so it is harder for officials to detect them compared to the bigger e-cigarettes of yesteryear.

“We’ve seen significant increases across the student body,” said Robert Keuther, principal at Marshfield High School in Massachusetts, as quoted by the Tri-City Herald. “This is not something specific to one group of kids. It’s across all of my grades, nine to 12. It’s all students.”