E-Cigarette Use Tripled In Schools Between 2013 & 2014
Back in 2011, just 1.5 percent of U.S. high school students said they had used an e-cigarette over the past 30 days while nearly 16 percent had smoked a cigarette. Fast forward to 2014 and 13.4 percent of students in high school said they had used an e-cigarette compared to just 9.2 who smoked a conventional cigarette.

Description
This chart shows the percentage of U.S. high school students reporting e-cigarette and cigarette use in the past 30 days.