More than 2,000 teens begin abusing prescription pills each day, according to the National Survey on Drug Use and Health -- making prescription pills the most common drugs teens use to get high after marijuana. According to new research, anti-anxiety and sleeping pills may carry an especially high risk of abuse, particularly among teens who have been prescribed these medications. Teenagers prescribed medication for anxiety or sleep problems are up to 12 times more likely to abuse those drugs -- either by using someone else's prescription pills to get high or by other means of experimentation -- than those who had never had a prescription, according to the University of Michigan research. While these medications are important in treating anxiety and sleeping problems, nursing professor Carol Boyd, the study's lead author, says that the number of teens being prescribed and misusing these medications is "disturbing." Researchers tested 2,750 teenagers from five Detroit-area schools, 9 percent of whom had received a prescription for anxiety or sleeping pills at some point during their lives.