Prescription drugs:
The number of Americans abusing prescription drugs nearly doubled from 7.8 million in 1992 to 15.1 million in 2003, the Narcotics Control Board said. Among their prescription drugs of choice: the painkillers oxycodone, sold under the trade name OxyContin, and hydrocodone, sold as Vicodin and used by 7.4 percent of college students in 2005.
