#Cannabisuse

A recent study conducted by researchers at the University of California San Diego has revealed that individuals diagnosed with cannabis use disorder are three times more likely to develop oral cancer compared to those without the disorder. This ground-breaking finding, published in July 2025, raises significant concerns for public health officials in Thailand, where the decriminalization of cannabis has triggered a surge in cannabis consumption, especially among young adults and recreational users.

A large UC San Diego study finds that individuals with cannabis use disorder are about three times more likely to develop oral cancer than those without the disorder. Published in mid-2025, the research arrives as Thailand expands cannabis access, raising public health questions for a country navigating rapid legalization and shifting social norms.

Oral cancer affects the mouth, gums, and throat and remains a global health challenge, including in Thailand, where oral cavity cancers contribute a notable share of cancer deaths. Traditional risk factors such as tobacco and alcohol use have long driven these outcomes. The UC San Diego study analyzed hundreds of thousands of electronic health records and identified a robust link between chronic, problematic cannabis use and higher oral cancer risk, after careful adjustment for tobacco and alcohol consumption.