The findings released Wednesday were based on an annual survey of 47,000 eighth-, 10th- and 12th-graders conducted by the University of Michigan for the National Institute on Drug Abuse. One of every 15 high school seniors reported smoking pot on a daily or near daily basis, the highest rate since 1981. Researchers also noted one of every nine high school seniors reported using synthetic marijuana within the previous 12 months. Researchers say use of a particular drug drops when teens consider it dangerous. The percentage of teens who see "great risk" in using marijuana generally has dropped in recent years.
