The percentage of high school seniors who used e-cigarettes in the last 30 days nearly doubled to 20.9 percent from last year, results of a survey released by the National Institute on Drug Abuse showed on Monday. The increase in vaping by 10th and 12th graders was the largest year-over-year jump for any substance ever measured by the survey, which started 44 years ago. The annual survey, which also measures use of other substances including marijuana, alcohol and opioids, questioned more than 44,000 students from 8th, 10th and 12th grades in U.S. public and private schools. The percentage of high school students who used nicotine-based vaping devices, known as e-cigarettes, has risen by a t... [Read more]