A Canadian study of six million Ontarians (2008-2021) found that middle-aged and older adults seeking hospital care due to cannabis use had nearly double the risk of developing dementia within five years compared to the general population. Even accounting for other health factors, cannabis users still showed a 23% higher dementia risk. While the study doesn't determine causality or usage levels, it highlights a concerning association between cannabis use and dementia risk in this population.

Prepared by Olivia Bennett and reviewed by editorial team.