The Channel 4 presenter said he felt 'frightened, paranoid, and felt physically and mentally wrapped in a dense blanket of fog' after taking the drug for an experiment
The 67-year-old says he felt like his “soul had been wrenched from my body” after smoking the strong cannabis for a TV show.
Snow is one of the ‘guinea pigs’ trying skunk for Drugs Live but insists he would never take it again after being filmed inhaling the substance.
Far from enjoying the ‘high’, Snow said it left him feeling vulnerable.
Snow, who said he had previously smoked cannabis in his youth at parties around a dozen times, said: “I never experienced anything beyond a slight sense of mellowness.
“By the time I was completely stoned I felt utterly bereft. I felt as if my soul had been wrenched from my body. There was no one in my world. I felt I had lost all control and had only the vaguest awareness of who I was and what on earth I was doing.
"I cascaded into a very, very, dark place, the darkest mental place I have ever been. I was frightened, paranoid, and felt physically and mentally wrapped in a dense blanket of fog. I lost all sense that I was being filmed by Channel 4.”
He said he stumbled along the corridor for his MRI scan afterwards but felt trapped once he was being examined.
“I’ve worked in war zone but I’ve never been as overwhelmingly frightened as I was right then – and as I emerge from the scanner you see me blearily sitting up and hugging young Dr Rebecca for my dear life, as if she was my mother.
“It took me four hours to come down. Just toward the end I felt a sense of euphoria and expressed it by drawing a pastoral scene on an old box that was lying around in the lab. I drew trees, a fence, a river, and a couple of people – perhaps the very people, trees, and water, that I had felt so deprived of whilst stoned.”
Referring to the prospect of getting ‘high’ again, Snow said: “I would never do it again. I can fully believe this week’s figures that tell us that 25 per cent of all psychosis treated in Britain is associated with smoking skunk.
“But what I know, every citizen should know, this is a dangerous, horrible substance.
I had no idea it could be so powerful and terrifyingly mind altering. And I am someone who worked for three years in a drug dependents day centre.”
The full results of Snow and other participants will be seen on Drugs Live on Channel 4 on March 3.
"Another session was to involve ‘adulterated skunk’ in which the drug’s two worst chemicals had been removed. Another was to involve a placebo.
He said he knew within five minutes that he had taken skunk.
Snow said he stumbled along the corridor to the MRI scanner so the doctor could see what the skunk was doing to my brain.
He said he felt a sense of 'terror' as he lay in the machine.
It took me four hours to come down.