Marijuana smoker at a demonstration in favor of legalizing marijuana in Mexico City.
A man smokes marijuana from a pipe during the International Day for the Legalization of Marijuana in Medellin, Colombia.
A manager of Sunset Junction medical marijuana dispensary, shows marijuana plant buds in Los Angeles.
A gardener cleans up marijuana plants at a marijuana growing operation in Oakland, California.
An estimated 15,000 people all exhale marijuana smoke as the clock hits 4:20pm at the University of Colorado in Boulder, Colorado.
A salesperson bags up a sale for a customer at Dr. Reefer's marijuana dispensary at the University of Colorado.
A soldier pulls up marijuana plants in an illegal plantation in Tecate, northern Mexico.
A soldier stands over an altar in a camp used by marijuana growers during a marijuana destruction operation in the Sierra de Juarez in Ensenada, Mexico.
Police are pictured with two of the 14 wild black bears that were guarding an illegal marijuana growing operation.
A Mexican soldier arranges blocks of marijuana, weighing a total of 46 tons, before they are incinerated at a military base in the border city of Tijuana.
A soldier walks through a cloud of smoke from burning marijuana on an illegal plantation in Tecate, northern Mexico.
Mexican soldiers stand in formation as 46 tons of marijuana is incinerated at a military base in the border city of Tijuana.
A vice president at Abundant Healing store (left), hands over a check to one of his marijuana suppliers in Fort Collins, Colorado.
A police officer stands guard during a drug destruction in Panama City. 4.7 tons of cocaine, marijuana and heroin seized by the police were incinerated.
A woman holds up 1.5 gram "care packages" of medical marijuana at the HarborsideHealth Center in Oakland, California.
The slain body of a drug hitmanafter an operation by Mexican soldiers at a ranch near the municipality of Sabinas Hidalgo, 100 km from Monterrey, Mexico.
Thank You Marijuana plants lay in a pile before being burned in Juarez, Mexico.