Christopher Biggins "threw up millions of times" after he ingested marijuana.
The TV legend agreed to try some of the Class-B drug as part of the new ITV programme 'Gone To Pot', which she filmed with Pam St. Clement, Bobby George, Linda Robson and John Fashanu, but the ingredient clearly didn't agree with him as he was unable to stand, vomited several times and had to be escorted to bed.
Speaking on 'Loose Women' on Friday (10.11.17), he said: "I was so ill, I couldn't stand up, and I threw up millions of times. And then I couldn't walk so i had to be taken off the bus and put into a bed... The next morning I woke up and I'm in a cave with trees and things... I thought I'd died and gone to hell."
And the 68-year-old star was left even more puzzled when he woke up in the morning to find him surrounded by large trees - and was actually convinced he'd died.
He explained: "I woke up in a cave filled with trees, and thought, 'I've died and gone to hell.' We were in fact in the Madonna Inn, in California, where I've always wanted to go and I was in the jungle room!"
Despite his horrific experience with edible marijuana, Biggins believes it is a "fantastic plant" for medical reasons and has helped so many people with seizures.
He added: "We all felt that medicinally it is a fantastic plant. It does so many amazing things... Something has to be done because it's helping people who need to be helped."
Meanwhile, former 'EastEnders' actress Pam recently opened up about smoking a joint and bong at an 'alternative' art class as part of the programme.
She explainedr: "We were taken to this warehouse . . . there were easels, tables and chairs. We jumped in with both feet and sat down and started to paint this cactus.
"The guy came round with this joint and I took a puff, and [dart player Bobby George] took a puff then we got on with this painting. I thought, 'Oh well this a terrible painting and I don't know what to do with it'. I made it into an alien in the end. It wasn't a cactus at all."
'Gone To Pot' starts on ITV at 9pm on Monday (13.11.17).
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