New research has shown that smoking high strength skunk or smoking cannabis for many years greatly increases the risk of psychosis.
They say that they\’ve solcved the causality problem:
Dr Di Forti said the study helps to disprove a popular hypothesis that mental health problems were linked with cannabis because people who were already ill were attracted to drugs in an attempt to ease their symptoms.
She said: "There is no evidence that people who develop psychosis have used cannabis because they were already ill. Other studies have shown people who smoking cannabis quite heavily had no psychotic symptoms before they started."
Anyone with enough medical (or statistical) knowledge to tell whether this is in fact true or not?