I have a friend who teaches high school. He said it’s a huge problem. Unlike cigarettes, students can actually smoke them in the classroom since there isn’t a strong lasting smell. He said he would turn his back, and just see smoke going up in the air. Can’t imagine how often students smoke in the bathroom.
I saw somewhere that all of the huge gains made in reducing smoking among teens over the past few decades have been completely erased thanks to e-cigarettes.