Using cannabis can have a profound effect on one’s mental health. Canadian researchers have found that those who consistently use cannabis are more likely to develop an anxiety disorder, which could potentially impact millions of people. With cannabis now the third most commonly used drug globally, after alcohol and nicotine, understanding its effects on mental health has never been more critical.

The study spanned over a decade (2008 to 2019) and included over 12 million participants, making it one of the most comprehensive analyses of its kind. Researchers specifically looked at those who had emergency department (ED) visits due to cannabis use and tracked subsequent healthcare visits for anxiety disorders, comparing them to the general population.

Researchers say the findings were striking. Within three years of an ED visit for cannabis use, 12.3% of these individuals needed a healthcare visit for an anxiety disorder, a rate 3.7 times higher than the general population. When broadening the criteria to include outpatient visits, the rate jumped to 23.6%, nearly four times the general population’s rate. This elevated risk was consistent across all groups (including age and gender) but was notably higher in young males.

Study lead author Dr. Daniel Myran said, “Our results suggest that individuals requiring emergency department treatment for cannabis use were both at substantially increased risk of developing a new anxiety disorder and experiencing worsening symptoms for already existing anxiety disorders.”

This study’s scale and depth provide strong evidence of a significant association between cannabis-related emergency visits and subsequent anxiety disorders. This is particularly concerning given the global rise in cannabis use and potency. With countries moving towards legalization and commercialization, the potential for increased cannabis use and associated harms, including anxiety disorders, is a pressing concern.