Some of the chemicals in cannabis (marijuana) have been shown to potentially have anti-tumor properties.
In this study, 434 patients with head and neck squamous cell carcinoma were compared to matched individuals of age, gender and town of residence, and information was gathered on lifetime marijuana use.
The authors found that 10-20 years of marijuana use was associated with a significantly reduced risk of head and neck squamous cell carcinoma.
They even found that in subjects with similar levels of tobacco smoking and alcohol use, marijuana users still had a lowered risk for the cancer.
