Jon Stewart (tries to) laugh at CNN's weed obsession

CNN did well on Sunday night in the ratings with its marijuana-focused

Sanjay Gupta

special "Weed 3," his third on the subject, and a new series "High Profits" about growers in Colorado.

Jon Stewart, whose final day on "The Daily Show" will be August 6, had some fun with the whole concept of CNN and weed Monday night. He titled the report "Uncle Jonny's Super Kush Totally Chillaxed Sticky-Icky Informative Marijuana News Report."

He donned a ridiculous rainbow wig and a pot-leaf necklace for effect on 4/20.

"CNN is cool as f***!" Stewart said.

But the shows are ultra serious."I'm ready for Weedstock," he said. "You're going to bore with me an economic lesson?" Yes, Jon, yes.

"This pot story isn't fun at all! It's all about disease and taxes. How  about free love and hot boxin'?"

Fortunately, Jessica Williams schooled Stewart: "Pot isn't just for shirtless old dudes with bongos. It's a non-addictive proven effective medical treatment raising much needed revenues for schools, libraries and roads."