DEN2001042002 - 20 APRIL 2001 - DENVER, COLORADO., USA: Mike, P., 19, of Denver, CO., smokes a joint (Marijuana cigarette) Friday afternoon at 4:20 PM in front of the Colorado State Capitol in downtown Denver, CO, during the 1st annual 420 day. About 1000 marijuana supporters gathered peacefully from 2 to 6 PM, Friday, in Denver, CO., APRIL 20. br/Bill Ross UPI |
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After exercising on a treadmill for 10 30-minute sessions during a two-week period, their craving and use of marijuana was cut by more than 50 percent, said Martin, the study co-author.
"This is 10 sessions but it actually went down after the first five -- the maximum reduction was already there within the first week," Martin said in a statement. "It shows that exercise can really change the way the brain works and the way the brain responds to the world around us and this is vital to health and has implications for all of medicine."
In 2009, about 16.7 million Americans age 12 or older reported using marijuana in the previous month and 6.1 million used the drug on 20 or more days per month, Martin said.