Cannabis is responsible for 91 per cent of cases where teenagers end up being treated for drug addiction, shocking new figures reveal.

Supporters of the drug claim it is harmless, but an official report now warns the ‘increased dominance of high-potency herbal cannabis’ – known as skunk – is causing more young people to seek treatment.

The revelation comes amid growing concerns that universities – and even some public schools – are awash with high-strength cannabis and other drugs.

The findings also back up academic research, revealed in The Mail on Sunday over the past three years, that skunk is having a serious detrimental impact on the mental health of the young. At least two studies have shown repeated use triples the risk of psychosis, with sufferers repeatedly experiencing delusional thoughts. Some victims end up taking their own lives.

The latest UK Focal Point on Drugs report, drawn up by bodies including Public Health England, the Scottish Government and the Home Office, found that:

Cannabis is responsible for 91 per cent of cases where teenagers end up being treated for drug addiction, shocking new figures reveal (file photo)

Over the past decade, the number of under-18s treated for cannabis abuse in England has jumped 40 per cent – from 9,043 in 2006 to 12,712 in 2017;

Treatment for all narcotics has increased by 20 per cent – up from 11,618 to 13,961;

The proportion of juvenile drug treatment for cannabis use is up from four in five cases (78 per cent) to nine in ten (91 per cent);

There has been a ‘sharp increase’ in cocaine use among 15-year-olds, up 56 per cent from 16,700 in 2014 to 26,200 in 2016.

Last night, Lord Nicholas Monson, whose 21-year-old son Rupert Green killed himself last year after becoming hooked on high-strength cannabis, said: ‘These figures show the extent of the damage that high-potency cannabis wreaks on the young.

‘The big danger for young people – particularly teens – is that their brains can be really messed up by this stuff because they are still developing biologically. If they develop drug-induced psychosis – as Rupert did – the illness can stick for life.’

The large rise in the number of youngsters treated for cannabis abuse comes despite the fact that total usage is falling slightly.

The report concludes: ‘While fewer people are using cannabis, those who are using it are experiencing greater harm.’

Almost all cannabis on Britain’s streets is skunk, which is four times more powerful than types that dominated the market until the early 2000s. It can even trigger hallucinations.

Lord Monson said: ‘We really need Ministers to get a grip and launch a major publicity campaign about the dangers.’