Tommy Chong is battling cancer again.

On Tuesday at the 826LA 10th anniversary bash in Santa Monica, the 77-year-old "Cheech & Chong" star revealed to Us Weekly that he is undergoing treatment for rectal cancer.

"I've had some medical issues lately," the recent "Dancing With The Stars" alum revealed. "I got diagnosed with rectal cancer."

Previously in 2012, he had prostate cancer, but was able to get through it with the help of his favorite drug.

It's no secret that Chong loves to get high, and he's very grateful that marijuana is a huge help when it comes to dealing with the pain that comes with cancer.

"I'm using cannabis like crazy now, more so than ever before," the vocal advocate for the decriminalization of marijuana said. "I'm in treatment now. I've been-just the case either way, either I get healed or I don't. But either way, I'm going to make sure I get a little edge off or put up."

He also believes Joel S. Goldsmith's book "Spiritual Power of Truth" has played a huge part in his recovery.

"It's what's kept my head up," he admitted. "So that's my book."

He did not go into detail about his current treatments, but he has recently discussed his use of cannabis to heal the pain the first time around on HashBarTV, which is part of a group for marijuana legalization, according to the Inquisitr.

Watch the full interview for California Cannabis Hemp Initiative below, in which he revealed how he partially treated the prostate cancer with high-grade hemp oil.