Lower Bladder Cancer Risk Seen in Marijuana Users

Published: Thursday, Sep 26, 2013
Marijuana Marijuana users had a small but statistically lower risk of bladder cancer compared with people who smoked tobacco or did not smoke, a large retrospective cohort study showed.

Table. Bladder Cancer Risk Based on Smoking Patterns

Smoking Pattern Hazard Ratio, as Compared with Nonsmokers P Value
Tobacco only 1.52 .007
Cannabis only 0.55 .0484
Both 1.28 .1480
The bladder cancer study involved 84,170 men from the Northern and Southern Kaiser Permanente health regions participating in the CMHS. After excluding 680 men with a history of bladder cancer, investigators analyzed data for the remaining participants.


Thomas A, Wallner L, Quinn V, Slezak J, Chien G, Jacobsen S. Association between cannabis use and risk of bladder cancer: Results from the California Men’s Health Study. Presented at: the American Urological Association Annual Meeting; May 4-8, 2013; San Diego, CA. Abstract 1290.

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