Source: University of Montreal.

An UdeM study confirms the link between marijuana use and psychotic-like experiences in a Canadian adolescent cohort.

Going from an occasional user of marijuana to a weekly or daily user increases an adolescent’s risk of having recurrent psychotic-like experiences by 159%, according to a new Canadian study published today in the Journal of Child Psychology and Psychiatry. The study also reports effects of marijuana use on cognitive development and shows that the link between marijuana use and psychotic-like experiences is best explained by emerging symptoms of depression.

“To clearly understand the impact of these results, it is essential to first define what psychotic-like experiences…