Skip to content

    Mental Health Center

    Font Size
    A
    A
    A

    Heavy Marijuana Use Doesn't Damage Brain

    Analysis of Studies Finds Little Effect From Long-Term Use
    By
    WebMD Health News

    July 1, 2003 -- Long-term and even daily marijuana use doesn't appear to cause permanent brain damage, adding to evidence that it can be a safe and effective treatment for a wide range of diseases, say researchers.

    The researchers found only a "very small" impairment in memory and learning among long-term marijuana users. Otherwise, scores on thinking tests were similar to those who don't smoke marijuana, according to a new analysis of 15 previous studies.

    In those studies, some 700 regular marijuana users were compared with 484 non-users on various aspects of brain function -- including reaction time, language and motor skills, reasoning ability, memory, and the ability to learn new information.

    Surprising Finding

    "We were somewhat surprised by our finding, especially since there's been a controversy for some years on whether long-term cannabis use causes brain damage," says lead researcher and psychiatrist Igor Grant, MD.

    "I suppose we expected to see some differences in people who were heavy users, but in fact the differences were very minimal."

    The marijuana users in those 15 studies -- which lasted between three months to more than 13 years -- had smoked marijuana several times a week or month or daily. Still, researchers say impairments were less than what is typically found from using alcohol or other drugs.

    "All study participants were adults," says Grant, professor of psychiatry and director of the Center for Medicinal Cannabis Research Center at the University of California, San Diego School of Medicine.

    "However, there might be a different set of circumstances to a 12-year-old whose nervous system is still developing."

    10 States OK Marijuana Use

    Grant's analysis, published in the July issue of the Journal of the International Neuropsychological Society, comes as many states consider laws allowing marijuana to be used to treat certain medical conditions. Earlier this year, Maryland became the 10th state to allow marijuana use to relieve pain and other symptoms of AIDS, multiple sclerosis, cancer, glaucoma, and other conditions -- joining Alaska, Arizona, California, Colorado, Hawaii, Maine, Nevada, Oregon, and Washington.

    Medicinal marijuana is available by prescription in the Netherlands and a new marijuana drug is expected to be released in Great Britain later this year. In the U.S. and elsewhere, Marinol, a drug that is a synthetic form of marijuana and contains its active ingredient, THC, is available by prescription to treat loss of appetite associated with weight loss in AIDS patients.

    Today on WebMD

    contemplation
    Differences between feeling depressed or feeling blue.
    lunar eclipse
    Signs of mania and depression.
     
    man screaming
    Causes, symptoms, and therapies.
    woman looking into fridge
    When food controls you.
     
    Woman standing in grass field barefoot, wind blowi
    Article
    senior man eating a cake
    Article
     
    Phobias
    Slideshow
    woman reading medicine warnings
    Article
     
    depressed young woman
    Article
    man with arms on table
    Article
     
    veteran
    Article
    man cringing and covering ears
    Article
     

    WebMD Special Sections