Woody Harrelson

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Actor Woody Harrelson is a long-time activist for the legalization of marijuana and hemp.

Michael Phelps

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USA Swimming suspended Olympic superstar Michael Phelps for three months on February 5, 2009, a "reprimand" after a published photograph showed him apparently smoking marijuana from a bong.

Randy Moss

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Wide receiver Randy Moss (formerly of the Minnesota Vikings ... twice) was caught with marijuana during a traffic arrest in Minneapolis in 2002. He later told Bryant Gumbel he smoked pot "every blue moon."

Matthew McConaughey

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Matthew McConaughey, who memorably played a '70s stoner in the movie "Dazed and Confused," has been arrested for possession of marijuana.

Willie Nelson

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Musician Willie Nelson is seen in a booking photo November 26, 2010 in Sierra Blanca, Texas. Nelson was arrested for possession of marijuana and released on $2,500 bond. Nelson 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.

Lil' Wayne

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Rapper Lil' Wayne has been caught with pot on multiple occasions. In 2006, he was arrested for possessing illegal drugs, including marijuana, and unmarked bottles of numerous prescription drugs. In 2007, a NYC officer caught him smoking marijuana at one of his concerts.

Snoop Dogg

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Rapper Snoop Dogg has been arrested multiple times for possession of marijuana, and has endorsed "Chronic Candy," a confection that allegedly tastes like marijuana.

Andre Agassi

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Tennis star Andre Agassi revealed that he smoked pot at an early age in his autobiography "Open."

Frances McDormand

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Oscar-winning actress, and wife of Minnesota-native director Joel Coen, Frances McDormand was featured on the cover of High Times and 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."

Paris Hilton

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Socialite Paris Hilton was charged with marijuana possession in South Africa. Those charges were later dropped, but there exist multiple home videos showing Hilton smoking a substance.

Nicole Richie

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

Cheech & Chong

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Comedians Richard "Cheech" Marin and Tommy Chong ... well, 'nuff said.

Natalie Portman

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Oscar-winning actress Natalie Portman confessed to smoking marijuana during her college days, according to the website Friends of Cannabis.

Barbra Streisand

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Actress Barbra Streisand is quoted as saying, in a 1972 Rolling Stone interview, "I'd take out a joint and light it. First, just faking it. Then I started lighting live joints, passing them around to the band, you know. I was great, it relieved all my tensions. And I ended up with the greatest supply of grass ever."

Bill Clinton

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Former U.S. President Bill Clinton famously replied to a question on the campaign trail over whether he ever smoked marijuana with the answer, "I experimented with marijuana a time or two, and didn't like it. I didn't inhale and I didn't try it again."