The research team, made up of seven researchers from the U.K., Denmark and Ireland, analysed self-reported measures of lifetime drug use among 4,718 Danish 24-year-olds. The participants’ reports were linked to the Danish psychiatric registry system which was utilized as an objective mental health status indicator.

What the researchers found may finally debunk the “cannabis causes psychosis” argument, which is often used to justify keeping it illegal:

“Compared with no drug use, the use of cannabis only did not increase the risk of psychosis while the odds ratio for cannabis and other drug were statistically significant.”

If cannabis use, on its own, does not cause psychosis, will the British Government be forced to legalise, as the apparent link between cannabis use and psychosis seems to be the only strong argument for maintaining prohibition?