Woody Harrelson

Woody Harrelson is an activist for the legalization of marijuana and hemp. (Photo Credit: Kevork Djansezian/Getty Images)

Ricky Williams

Running back Ricky Williams ran into much trouble with the NFL for violating the league's substance abuse policy. (Source: Eliot J. Schechter/Getty Images)

Matthew McConaughey

Matthew McConaughey played a stoner in the movie "Dazed and Confused." He has been arrested for possession of marijuana as well. (Source: Koichi Kamoshida/Getty Images)

Willie Nelson

Legendary country singer Willie Nelson was arrested and charged with marijuana possession in November 2010 after six ounces of pot was found aboard his tour bus in Texas. Nelson, 77, has made no secret of his love of ganja. The outspoken advocate for the legalization of marijuana was busted at a traffic stop in 2006 for one-and-a-half pounds of pot and a bag of mushrooms. (Source: AP)

Seth Rogen

Seth Rogen plays a pot smoker in the movies "Knocked Up" and "Pineapple Express." (Source: CBS)

Lil Wayne

Lil Wayne was released from jail on November 5, 2010. He was put in jail for gun possession in February 9, 2010. (Source: AP)

WonderBoys

March 1, 2000 -- Michael Douglas and Tobey Maguire star in 'Wonder Boys.' (Source: Handout/Getty Images)

Weeds_HBO

The HBO SHOW "Weeds" revolves around a widowed housewife (May-Louise Parker) from an affluent California suburb who becomes her neighborhood's marijuana dealer to make ends meet. (Source: HBO)

Snoop Dogg

Rapper Snoop Dogg plays a marijuana dealer in the movie "The Wash" with Dr. Dre. He also has been arrested for marijuana possession. (Source: AP)

Ray Charles

The blind blues singer Ray Charles strugged with a drug problem. He was known to smoke marijuana as well as use other drugs. (Source: AP)

Natalie Portman

Natalie Portman confessed to smoking marijuana during her college days, according to the website FriendsofCannabis.com. (Source: AP)

Kristen Stewart

Actress Kristen Stewart plays a pot smoker in the movie "Adventureland." (Source: Jason Merritt/Getty Images)

Frances McDormand

Frances McDormand was on the cover of High Times in May 2003, in which she said, "I'm a recreational pot-smoker. There has never been enough of a distinction between marijuana and other drugs. It's a human rights issue, a censorship issue, and a choice issue." (Source: MGM/UA Home Entertainment)

Dr Dre

Producer/rapper Dr. Dre's hit 1990s album "The Chronic" was named after a slang term for high-grade marijuana. (Source: Aftermath)

Dave Chappelle

Dave Chappelle starred in the 1998 movie "Half Baked" about potheads who sell marijuana to raise bail for a fellow stoner who accidentally killed a horse. (Source: AP)

Cheech and Chong 1981

Cheech and Chong's stoner humor was a huge hit in the 70s and 80s. (Source: AP)

Brad Pitt

Brad Pitt used to love to smoke weed, but gave it up for his family. (Source: Frazer Harrison/Getty Images)

Billy Bob Thornton

Actor Billy Bob Thornton plays a marijuana grower in the movie "Homegrown." (Source:Carlo Allegri/Getty Images)

Andre Agasse

Andre Agassi revealed that he smoked pot at an early age in his autobiography "Open." (Source: AP)

Nicole Richie

Nicole Richie admitted to having smoked pot, as well as taking a Vicodin, when she was arrested for a DUI charge in 2007. (Source: CBS)