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    Heavy Meth Use Linked to Schizophrenia

    THURSDAY, Nov. 10 (HealthDay News) -- Heavy methamphetamine use may increase the risk of developing schizophrenia, according to a new study.

    It also confirmed previous research showing a possible link between marijuana dependence and schizophrenia.

    Methamphetamine and other amphetamine-type stimulants are the second most common type of illicit drug used worldwide.

    In this study, researchers at the Centre for Addiction and Mental Health (CAMH) in Toronto analyzed the records of patients who were admitted to California hospitals between 1990 and 2000 with a diagnosis of dependence or abuse for methamphetamine, marijuana, alcohol, cocaine or opioids.

    People who were hospitalized for meth dependence and who had never been diagnosed with schizophrenia or psychotic symptoms at the start of the study had a roughly 1.5- to three-fold higher risk of later being diagnosed with schizophrenia than patients who used cocaine, alcohol or opioid drugs, study leader Dr. Russ Callaghan said in a CAMH news release.

    The researchers also found that the increased risk of schizophrenia in methamphetamine users was similar to that of heavy users of marijuana.

    The study was published online Nov. 8 in the American Journal of Psychiatry.

    It's not clear how methamphetamine and marijuana may increase the risk of developing schizophrenia.

    "Perhaps repeated use of methamphetamine and cannabis in some susceptible individuals can trigger latent schizophrenia by sensitizing the brain to dopamine, a brain chemical thought to be associated with psychosis," Dr. Stephen Kish, senior scientist and head of CAMH's Human Brain Laboratory, said in the news release.

    "We hope that understanding the nature of the drug addiction-schizophrenia relationship will help in developing better therapies for both conditions," Callaghan said.

    More information

    The U.S. National Institute of Mental Health has more about schizophrenia.

     
    • Ben  •  6 mths ago
      This study confirmed a previous study which shows a possible link between pot and schizophrenia? That is saying a whole lot of nothing! Confirming a possible link?
      • labour of moles 6 mths ago
        They just wanted to remind us about the dangers of the 'evil weed'...
      • k w vet 6 mths ago
        ha ha just listen to the libb's trying to justify drug use,if pot and meth,cause schizophrenia,then 70% of libbaturds have it
      • labour of moles 6 mths ago
        ha ha just listen to the zombie who can't think on his own, making a statement in direct contradiction to the news article. It's obvious you just retained what you wanted to see because otherwise you would have read and understood the entire article before spewing out such an assinine comment.
    • J  •  6 mths ago
      correlation is not causation!
      • Emmet Otter 6 mths ago
        What does race have to do with this?

        Oh, wait...causation. Never mind.
      • Edward 6 mths ago
        Brought to you by the American Tobacco Institute.
      • H g 6 mths ago
        In this case, oh yes, most definitely, meth caused schizo! You can not not mess with yourself to the degree that meth does and not get such a strong adverse reaction.
    • anthonyl  •  Sugar Land, United States  •  6 mths ago
      This just in- The study also revealed that 100% of those with schizophrenia had also consumed water and breathed air the study revealed.
    • Mike  •  6 mths ago
      How was this study controlled??? Doctors have known for at least 40 years that people developing "Major Mental Illnesses" are likely to try "self medication" with Alcohol, MJ, Narcs and Stimulants. This study proves nothing.
      • ME 6 mths ago
        Thanks! from the families who's loved ones have suffered from this disease!
      • John 6 mths ago
        Meth is also the most common choice for self-medication for those who have already developed schizophrenia. My heart goes out to you Bryan, it is a terrible disease.
      • Vicky 6 mths ago
        my daughter has schizophernia and self med herself to get rid of the voices she has had all her life. of course, she wasn't diagnosed until after the fact because of no health insurance. this study is a bunch of crock!!
    • J  •  6 mths ago
      This article sounds a little paranoid to me...
      • A Yahoo! User 6 mths ago
        Too bad they can't simply smoke a joint and relax. Fear mongers at it again.
      • Zoey 6 mths ago
        Lol. Yeah. But look who is reporting this all..Yahoo. o_o
      • BB 6 mths ago
        Too bad I'm the only one to get the humor in this post so far ;)
    • Jon  •  6 mths ago
      The big thing to remember in the Cannabis/Schizophrenia discussion is that they constantly talk about Latent Schizophrenia. That is to say that some people are already predisposed to Schizophrenia and Cannabis SEEMS to slightly increase their risk of developing Schizophrenia...this group of people is very small and would likely develope Schizophrenia anyways.

      Regardless, smoking weed all day and night is not good for anyone... Just as every other legal or illegal substance has the potential to affect you. This seems to be 'their' only remaining argument against legalization that has any legs to stand on, but they are thin and shaky legs.
    • Robert  •  Osaka-shi, Japan  •  6 mths ago
      Next they'll tell us that smoking marijuana is linked to X-BOX addiction and eating horrible snack foods.
    • Mark  •  6 mths ago
      Let me consult my other personality before I express any comments...
    • soulwoman  •  Washington, United States  •  6 mths ago
      is there enough room anywhere to list the things meth could be linked too??
    • Jknoxx  •  San Diego, United States  •  6 mths ago
      “Why Pot Smokers Are Paranoid”. We all know the reasons – 850,000 of us will be arrested, thousands more will get tickets in decrim states which will cost the driver’s licenses of some, millions more will fear detection at work or in their public housing or dorm room and the risk of losing those privileges, and a few hundred of us will have our doors broken down by body-armored police with automatic weapons who will shoot and kill our pets.
    • Cabo San Dan  •  Las Vegas, United States  •  6 mths ago
      the same thing could be said about alcohol. however, it all boils down to individual choice.
      the government has no right to mandate what you can, and can not do with your own body.
      pot should not be placed in the same category as meth
    • OmelasNation  •  6 mths ago
      Perhaps the susceptible individuals were going to develop schizophrenia anyway...?
      You have no cause, but conclude the effect...?
      Try researching the Scientific Method next time...,
    • JH  •  Oakland, United States  •  6 mths ago
      Treadmill usage linked to being overweight.
    • chris  •  Atlanta, United States  •  6 mths ago
      That is ridiculous. Why does the government try so hard to make marijuana seem bad?
    • QM  •  6 mths ago
      Hey, meth sucks, but perhaps people who are at risk for schizophrenia are more succeptable to drug and aclohol abuse.
    • kristi  •  6 mths ago
      I bet you could find most people with schizophrenia have used alcohol too, or maybe they ate tacos, or microwave popcorn. I call #$%$ !
    • Jim  •  6 mths ago
      pharma companies hate natural cures
    • Franksta  •  Bailey, United States  •  6 mths ago
      More likely it is Schizophrenics self medicating. This can be irritating, but it is not the fault of the pot.

      Obviously your typical stoner is generally a lot less trouble socially than an alchohol user, but a self medicating schizophrenic who happens to have chosen weed can be a handful because of the tendency to invest a lot of energy into their delusions and try and drag the people around them in. Again, this isn't marijuana's fault, and I know I should probably be more compassionate, etc. Just pointing out that when you come across a reclusive, paranoid, completely delusional pothead (usually in Oregon somewhere, but NoCal, Upstate NY, and VT are other hotbeds) it is probably a self-medicating schizophrenic, because they CAN live in certain highly sheltered environoments on the margins. It is nobody's fault - but give them a wide berth. There should be a warning label on pot that says "Mistrust Non-Secular Revelations" or simply "Don't Get All Baked And Tell Your Friends It Is The End of the World Because You are Probably Just A Self Medicating Schizophrenic." Anyway, have fun and be careful.
    • RobertG  •  Lynchburg, United States  •  6 mths ago
      I'm beside myself!! after reading this one.
    • A Yahoo! User  •  6 mths ago
      Well.. scientific proof that meth addicts and potheads get paranoid. Yawn..
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