POSTED: Tuesday, May 8, 2012 - 8:00am
UPDATED: Tuesday, May 8, 2012 - 8:15am
NBC NATIONAL NEWS — Heavy marijuana use by teenagers is up 80 percent since 2008, according to a national survey released by The Partnership at Drugfree.org and the MetLife Foundation.
Nearly 10 percent of U.S. teens about 1.5 million youth smoked marijuana heavily, some 20 times in the past month, according to the Partnership Attitude Tracking Study, sponsored by MetLife Foundation.
In the past month use of marijuana is up 42 percent.
In the past year use of marijuana is up 26 percent.
In a lifetime use of marijuana is up 21 percent, which translates to 8 million teens