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FILE - In this Feb. 5, 2015 file photo, Willie Nelson performs at the 17th Annual GRAMMY Foundation Legacy Concert at the Wilshire Ebell Theatre in Los Angeles. Nelson announced Monday, April 20, 2015, he plans to roll out his own brand of marijuana called ``Willie’s Reserve,’’ that will be grown and sold in Colorado and Washington, two states where recreational use of the drug is legal. (Photo by Chris Pizzello, file/Invision/AP) Image Credit: Chris Pizzello/Invision/AP

Country music star Willie Nelson announced plans on Monday to roll out his own brand of marijuana, capitalising on his association with the drug and the unofficial stoner holiday, 4/20.

The move makes the 81-year-old Roll Me Up and Smoke Me When I Die singer the latest celebrity to jump into the marijuana marketplace.

“Willie’s Reserve” will be grown and sold in Colorado and Washington, where recreational pot is legal. Nelson said in a statement that he’s “looking forward to working with the best growers in Colorado and Washington to make sure our product is the best on the market.”

Nelson joins other famous pot personalities, including rapper Snoop Dogg, who endorses vaporising products; singer Melissa Etheridge, developing marijuana-infused wine; and reality TV star and self-help guru Bethenny Frankel, who is working on a strain of Skinnygirl weed that wouldn’t leave users with the munchies.

“Like other industries, branding and creative marketing is a big part of supporting legal cannabis products,” said Vicki Christophersen, director of the Washington CannaBusiness Association.

Christophersen said these connections continue a long tradition of celebrities endorsing the use of marijuana — even decades before it became legal for adult use.

Nelson is among those with well-established connections to cannabis. He’s been a decriminalisation advocate and has been busted for pot possession several times. He also appeared in the stoner comedy Half Baked.

Washington and Colorado made pot legal for adult use in 2012. Oregon, Alaska and the District of Columbia also have removed legal restrictions, and more states are expected to vote on legalisation next year.

The moves have created marketing opportunities, but links to celebrity smokers aren’t always considered a positive.

This year, the National Cannabis Industry Association decided to drop actor Tommy Chong — co-star of the Cheech and Chong comedy team — as it prepared to lobby Congress for pot-friendly regulations. The group wanted to move past the stoner stereotypes they say Chong represents in favour of positioning pot as similar to fine wine.

Others see it differently, however.

Chong has an endorsement deal with Marisol Therapeutics, a pot shop in Pueblo, Colorado, that sells a strain in his name.

Store owner Mike Stetler called Chong marijuana’s equivalent of the Marlboro Man, and when it comes to pot pitchmen, he asked, “Who better?”