"Younger teens (ages 12 to 13 and 14 to 15) are more likely to say that they can get prescription drugs in an hour, and within a day, compared to marijuana, while older teens (16- to 17) are more likely to be able to get to marijuana within a day."

Source

QEV Analytics, LTD., "National Survey of American Attitudes on Substance Abuse XVII: Teens," The National Center on Addiction and Substance Abuse at Columbia University (New York, NY: National Center on Addiction and Substance Abuse at Columbia University, August 2012), p. 28.
http://www.casacolumbia.org/a…