"The cactus you see us preparing and cooking (in the film); that's what we drink. The boys took a different batch the next day and they all insisted they didn't feel a thing! I drank it at eight in the morning and it lasted pretty much the whole day.
"I've never taken Peyote or San Pedro and everybody said it's kind of like mushrooms ... I did feel nauseous but only for a half an hour. I felt great throughout.
"As the sun was setting I was sort of coming down. It was fantastic. I was tripping in the gorgeous Chilean desert under the bright sun with wild flowers bursting all over the place and my naked body under the sky. I loved every second of it!"
But Cera had a different experience: "It was underwhelming. It didn't work for anybody but Gabby and there had been a big build-up. We were driving around for a week in Chile, talking about it and thinking about it.
"It felt to me like a nice glass of Riesling."
And the actor admits he's a little worried about the reaction the film will get from drug users: "I am a little nervous about people who just smoke meth and coming up, 'You made that movie for us!'."
- WENN