Super-strength cannabis is responsible for one on four new cases of serious mental disorders, scientists will warn this week.
Potent 'skunk' cannabis is so powerful that the users' risk of a psychotic episode is tripled, say researchers at King's College in London.
Their report, leaked to The Mail on Sunday ahead of its publication this week, will reveal differences between weaker and stronger forms of the drug.
It will conclude there is an 'urgent need… to inform young people about the risks of high-potency cannabis'
t comes as Crime Survey figures for England and Wales show over a million youngsters aged 16 to 24 smoke cannabis.
