PIERS Morgan has shared a video of himself laughing as he smokes cannabis with Mike Tyson while recording the boxing legend's podcast.

The Good Morning Britain presenter joked "when in Rome" after inhaling on the joint with his sporting hero.

5 Piers Morgan smokes weed while hanging out with Mike Tyson Credit: @piersmorgan/Twitter

After being handed the marijuana, Piers innocently asked: "What am I supposed to do with this Mike?"

Mike shouted: "Smoke it."

Raising his eyebrows cheekily, the 54-year-old took a puff after it was lit up by the former boxer who cheered.

Mike threw his hands in the air as he encouraged the TV host, who looked at the camera before saying: "When in Rome, right?"

Piers had joined Mike to record a 90-minute interview for his Hot Boxin' podcast.

5 Mike lit him up Credit: @piersmorgan/Twitter

5 The boxing legend cheered on Piers to smoke a spliff Credit: @piersmorgan/Twitter

The drug is legal for both medicinal and recreational use in the state of California.

Now the former world heavyweight champion is launching a cannabis ranch resort in a bid to make a money from the law change.

Talking about his day with Mike, Piers wrote for the Mail on Sunday: " I found him sitting on a sofa in his offices near Manhattan Beach, smoking a massive spliff.

"As our chat wound up, I picked up one of the remaining spliffs on the table, looked at Tyson and said: ‘When in Rome, Champ… got a light?’

5 Piers was recording an episode of Mike's podcast in California where cannabis is legal Credit: @piersmorgan/Twitter

"He exploded with laughter as he passed me a lighter and carried on roaring as I lit up the joint and took a long – legal! – puff."

Piers even left with a gift package from him.

"We hugged again and he handed me a goody-bag of gifts of the leaf variety," said Piers.

"Whatever your side of the debate about marijuana – I view it as less dangerous than alcohol or cigarettes – I’ve never seen a happier, calmer Mike Tyson."

5 Piers' son Spencer joked about his dad smoking a joint

After Piers shared the video of him smoking weed, his humorous son Spencer wrote on Twitter: "Has one every morning before GMB. Starting to worry."

His dad jokingly replied: "I probably should... might calm me down a bit."

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