Tommy Chong undergoing treatment for rectal cancer

Tommy Chong revealed he is battling cancer again. The "Cheech & Chong" star told Us Weekly that he is undergoing treatment for rectal cancer.

"I've had some medical issues lately," Chong told the mag. "I got diagnosed with rectal cancer."

This isn't the first time the 77-year-old has fought cancer; he was diagnosed with prostate cancer in 2012.

The comic has long been vocal about his fondness of marijuana and said he is "using cannabis like crazy now, more so than ever before."

In 2012, he told Don Lemon how he used hemp oil and cannabis to treat his cancer.

"So [legalizing marijuana] means a lot more to me than just being able to smoke a joint with out being arrested...I'm taking it as medicine.