UFC heavyweight Roy Nelson has long been one of the MMA’s hardest hitting knockout artists.

Despite earning a jiu-jitsu black belt from one of the art’s most respected figures in Renzo Gracie, the portly Nelson has found fame for his clubbing punch-outs of the likes of Cheick Kongo, Matt Mitrione, and Mirko Cro Cop.

Sometimes however, his interviews hit the scene just as hard. As reported at MMA Frenzy, the man affectionately known as “Big Country” has always spoken his mind — leading his boss, UFC President Dana White, to call him an “absolute pain in the ass.”

In an interview released today at MMA Junkie, Nelson addressed the recent issues between Nick Diaz and the Nevada State Athletic Commission — and his perspective was interesting, to say the least.

“It’s a tough thing,” Nelson said. “I think I read Ronda Rousey on MMA Junkie say that marijuana shouldn’t be tested because it’s an invasion of privacy. When you smoke marijuana, or take marijuana, a lot of people don’t realize that it actually helps you perform through injuries, or pain. It’s kind of like taking pain pills.”

“There’s some people — it opens their mind,” he continued. “Talk to Eddie Bravo or Joe Rogan and they’ll say ‘it opens your jiu-jitsu mind!’ But there’s a lot of things physically that marijuana can help you with during camp…¬† Yes, if you smoke the day of the fight, and you’re high, it’s probably not going to work. But in camp, it can get you through the days.”

Nelson believes that Diaz and the NSAC should be in better communication.

“With Nick, it was your third time (failing),” he said. “It’s one of those things. He should have gotten a TUE, and they should have gave it to him. It’s not like they don’t know about this. You’ve got to use common sense.”

While both sides bear some blame, the NSAC “has to get its crap together,” says Nelson — noting that Jon Jones’ cocaine use, which he also believes to be a performance enhancer out of competition, went unpunished.

Nelson will return to the cage on September 26 to face Josh Barnett at UFC Fight Night 75 in Saitama, Japan.