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Study: History Of Marijuana Use Associated With Reduced Cancer Risk

cancer marijuana

(via healthtap.com)

By Paul Armentano, NORML Deputy Director

Cannabis use is inversely associated with incidences of bladder cancer in males, according epidemiological findings published in the February issue of the journal Urology.

Investigators at the Kaiser Permanente Los Angeles Medical Center, Department of Neurology assessed the association of cannabis use and tobacco smoking on the risk of bladder cancer in a multiethnic cohort of more than 80,000 men aged 45 to 69 years old over an 11-year period.

Researchers determined that a history of cannabis use was associated with a decreased risk of bladder cancer. By contrast, tobacco use was associated with an increased risk of cancer.

“After adjusting for age, race or ethnicity, and body mass index, using tobacco only was associated with an increased risk of bladder cancer (hazard regression 1.52) whereas cannabis use was only associated with a 45 percent reduction in bladder cancer incidence (HR 0.55),” investigators reported.

Subjects who reported using both tobacco and cannabis possessed a decreased risk of cancer (HR 1.28) compared to those subjects who used tobacco only (HR 1.52).

The study is the first to indicate that cannabis use may be inversely associated with bladder cancer risk.

Authors concluded:

“In this multiethnic cohort of 82,050 men, we found that cannabis use alone was associated with a decreased risk of bladder cancer. … [M]en who used tobacco alone were 1.5 times more likely to develop bladder cancer when compared with men who did not use tobacco or cannabis. … However, among men who used both substances, this risk of bladder cancer was mitigated. … If this represents a cause and effect relationship, this pathway may provide new opportunities for the prevention and/or treatment of bladder cancer.”

In 2009, Brown University researchers similarly reported that the moderate long-term use of marijuana was associated with a reduced risk of head and neck cancers in a multi-center cohort involving over 1,000 subjects. Investigators further reported that marijuana use “modified the interaction between alcohol and cigarette smoking, resulting in a decreased HNSCC (head and neck squamous cell carcinoma) risk among moderate smokers and light drinkers, and attenuated risk among the heaviest smokers and drinkers.”

Read the abstract of the study, “Association between cannabis use and the risk of bladder cancer: Results from the California Men’s Health Survey,” online here.

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Johnny Green


  1. Lets heal the world. That’s why I am supporting the Missouri Cannabis Restoration and Protection act here in Missouri. It just got approved here yesterday. Missouri Cannabis Reform group is helping gather volunteers for signatures. Anyone even in our neighboring states can help. Lets get legalization done for the people and not for big biz. Its time we the people take some power back https://www.facebook.com/groups/407826009376872/

  2. That’s why I have sort of leaned toward a neutral approach with these studies now. I feel both sides are pushing and inflating values back and forth. I do however still believe cannabis hides great medical value but I look at it this way: I have had nights involving too much alcohol and wake up with a sore body, acid reflux, and borderline the worst migraines or nausea I’ve ever experienced. In regards to “too much” cannabis use: I sometimes eat more than I should, Laugh my ass off, percieve life differently, and generally wake up after the best 8-10 hours of sleep of my life (if I have indica), still feel relaxed and great. So while I generally take studies at a glance now, the point is the beneficial studies generally align with my personal experience.

  3. This is old news by now. We all know that cannabinoids reduce your cancer risk and taking large doses of them in many cases will kill cancer. we already have the cure to cancer, actually multiple ones. Diet and herbal supplements seems to be a good one so far.


  4. Funny I just read an article about
    Children and “cannabidiols”
    These Drs claim this n that
    After saying “not enough research”
    Like they are quoting old propaganda from NIDA funded biased testing

  5. Rick Simpson proved this to us many years ago. It’s sad that the studies cannot keep up with his (re)discovery of essential plant medicine, because the government and big pharma are too greedy to let people heal themselves and ACTUALLY study this plant. So most of us are kept in the dark “until it’s too late”.

  6. Yes, it really surprises some people. And it scares the shit out of them. That’s the problem. People refuse to believe credible medical studies.I used to think when people get the evidence, things will change. They won’t, People that want “evidence”. Only accept things that support their point of view

  7. Does this really surprise anyone. People who do not believe government propaganda has known at least some of the benefits of Marijuana. This is just one more example and reason to push for legalization.

  8. The more evidence the better. As publishings keep getting around to both the general public, and the medical community at large, we will continue see a rise in support for rescheduling and eventually complete legalization.

    And the tide of truth rolls on washing away the lies =D

    Feels dam good doesn’t it?

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