"I'm in treatment now," Chong told Us Weekly. "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."
Chong tweeted about the news Wednesday morning.
I have good news and bad news. First the bad news, the cancer came back and it's a real pain in the butt.— Tommy Chong (@tommychong) June 17, 2015
The 77-year-old star, best known for "Cheech & Chong," says he's trying to say positive through a mix of reading and marijuana.
The good news is I now have to use more marijuana to treat the cancer.— Tommy Chong (@tommychong) June 17, 2015
Please wish me luck while I kick cancer's behind. Thank you for all of your love and support.— Tommy Chong (@tommychong) June 17, 2015
In 2012, Chong battled stage-one prostate cancer.