Fifteen percent (15%) of high school freshmen in the U.S. say they have taken OxyContin, Vicodin, Adderall, Ritalin or Xanax without a doctor’s prescription.  This according to the United States Center for Disease Control (CDC) 2009 Youth Risk Behavior Survey.

By the time they are seniors, that number has grown to 26%, or more than one in four.

Note that the survey did not ask about other opiate/opioid drugs like heroin or Dilaudid, other stimulants like cocaine, or other benzodiazepines like Valium or Klonopin.  And don’t forget alcohol.