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Over the past few years, cannabis has seen a significant increase in usage in various sectors. 

However, a recent study suggests that cannabis may not universally induce relaxation. 

Researchers found that 2% of individuals who sought emergency care for cannabis use developed a new anxiety disorder within three years. This study represents the largest examination of the link between cannabis use and anxiety.

Analyzing data from over 12 million people in Ontario, Canada, between 2008 and 2019, none of whom had prior anxiety diagnoses, the researchers compared the risk of anxiety disorder development among those seeking emergency care for cannabis use to the general population. Lead author Dr. Daniel Myran noted that individuals requiring emergency care for cannabis use were significantly more likely to develop new anxiety disorders or experience worsened symptoms of existing ones.

Demographic vulnerability

Breaking down the statistics, the study revealed that individuals seeking emergency care for cannabis use were nearly four times more likely to develop a new anxiety disorder within three years compared to the general population, even after adjusting for social factors and other mental health conditions. Additionally, the risk of hospitalization or revisiting the emergency room for anxiety disorders within three years was also higher.

Both men and women of all ages seeking emergency care for cannabis use were at elevated risk of developing new anxiety disorders relative to the general population, with younger people -- ages 10 to 24 -- and men particularly vulnerable.

Implications and caution

While there is ongoing debate about whether cannabis causes anxiety or if users are self-medicating pre-existing conditions, the study suggests that cannabis might exacerbate anxiety symptoms and potentially delay evidence-based treatments. Dr. Myran cautioned against the perception of cannabis as harmless, emphasizing that heavy use could elevate the risk of anxiety disorders in some individuals.