A RUGBY playing teen hacked off his own penis and almost killed his mum while high on a super-strong strain of cannabis.

The 16-year-old boy from Brighton had gone to bed with a knife because he feared that people lived in his walls.

2 Super-strength skunk has been linked to mental health problems Credit: Times Newspapers Ltd

He awoke in the dead of night and stabbed his mother before chopping at his genitals in a skunk induced psychotic episode.

The boy's dad told the BBC how the drug turned his "very bright, bubbly lad" into a paranoid "waste of space".

He said: "It was a whole tragic trip down hill.

"He basically had a psychotic episode and did huge amounts of harm to both himself and his mother.

2 The man said smoking skunk made his son so paranoid and delusional he ended up chopping off his own penis Credit: Joost Van Der Broek

"It was just absolutely devastating. you just can't imagine anything of that nature happening.

"The whole episode was just surreal.

"Looking back, it's almost as if I was peering in through a window and it's happening to somebody else."

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The man said his son tried the drug with a few mates before becoming "completely addicted".

He said his son had delusions, believing mermaids were real and thought "people were living in the walls".

His son said that after trying skunk regular cannabis had no impact whatsoever and following the incident spent time in prison ad a psychiatric unit.

He had to have several operations to re-attach his member but will still require further surgery.

His father added: "Medical science moves on a great deal. He'll be seeing a very top specialist in that particular area.'

"He's drug free and alcohol free. He's actually in really good form. He's got his wit back.

"He's the first to have a bit of black comedy as far as this is concerned. I feel like I've got my son back."

The harrowing admission comes as the Liberal Democrats are pledging to completely legalise cannabis if they win next week's general election.

The party’s manifesto is set to have a commitment to a fully-regulated marijuana market, which could raise up to £1billion in extra taxes.

But experts warn that as many as 60,000 Brits have mental illnesses brought on by smoking weed.

If anyone has concerns around drug use they are advised to contact FRANK at 0300 123 6600 or email frank@talktofrank.com