Mail Online 13 January 2014
Mental illnesses are triggered six years earlier in patients who have smoked high-strength cannabis every day, a study has claimed.
Mental health patients who smoked skunk daily – which has a high amount of the drug’s active ingredient, THC – had their first psychotic episode at an average age of 25, compared to 31 for non-users.
Yet the damage was not limited to heavy smokers or those using powerful cannabis, according to the Institute of Psychiatry at King’s College London.
Mental health patients with a general history of using cannabis still had their first psychotic episodes at 28 – three years earlier than those who never tried the drug.
And those who smoked the drug before they were 15 put themselves more at risk, with their first symptoms at the age of 27 instead of 29.