Prince Harry's US visa could be revoked after his claims that weed and psychedelics were a "fundamental" part of his life.
The royal told therapist Dr Gabor Mate he began using weed and ayahuasca - a psychoactive drink - to help cope with trauma from his past.
His admission came as part of an interview for Dr Mate's The Myth of Normal: Trauma, Illness, and Healing in a Toxic Culturen which he claimed: "I started doing it recreationally and then started to realize how good it was for me."
But according to some, US immigration officials take a Draconian stance when it comes to non-Americans using drugs in the country.
According to Piers Morgan, the Duke of Sussex may have jeopardised his stay by admitting his drug use for health reasons.
The talk show host, who makes no secret of his cynicism over Harry and Meghan's claims, said: "Harry has barely finished the global family trashing tour in support of his treacherous family trashing memoir, inevitably he’s decided the world hasn’t heard quite enough from him
"So Harry’s latest wheeze is a live therapy session with Dr Gabor Mate – a famed trauma expert – in which he reminded us again that he, Harry, is the world’s biggest victim."
Harry told Dr Mate that low-level recreational drug use had become a "fundamental part" of his life that "helped me deal with the traumas and the pains of the past".
In his memoir Spare, he wrote that he would smoke cannabis while living at Nottingham Cottage in 2015.
He also told Dr Mate in the show, which screened on Saturday, that cocaine "did nothing" for him.
"It was more a social thing and gave me a sense of belonging for sure, I think it probably also made me feel different to the way I was feeling, which was kind of the point.
"Marijuana is different, that actually really did help me."
South American entheogenic brewed drink ayahuasca, the royal claimed, was like "cleaning the windscreen" of the many filters from life.
"It removed it all for me and brought me a sense of relaxation, release, comfort, a lightness that I managed to hold on to for a period of time.
"I started doing it recreationally and then started to realise how good it was for me.
"I would say it is one of the fundamental parts of my life that changed me and helped me deal with the traumas and pains of the past."
Cannabis is legal in California, where Prince Harry currently resides, and while ayahuasca is permitted for religious use only in the States, certain cities have opted to decriminalise it.
Travelling into the US while carrying the substances however may be illegal, as cannabis for medical use is not regulated by the FDA.
In some instances in the past, however, British nationals like Harry have been barred from entering the US over drugs controversies - in 2014, Nigella Lawson was stopped from getting on a US-bound flight following her admission during an unrelated trial she had previously taken cocaine.
Piers Morgan continued that Harry should avoid boarding a plane to the UK for the King's coronation in May if he doesn't want to risk getting stuck on the way home.
"Another compelling reason why we don’t want them at the king’s coronation," said the controversial host.
"We might end up being stuck with them for good."
