Study: Marijuana Changes Brain


marijuanaIt’s all fun and games until your brain changes. Using marijuana just a few times per week can physically alter the structure of your brain, a study in The Journal of Neuroscience reported on Tuesday.

Scientists examined the difference in brain features between light smokers and non-smokers, and found volume, shape, and density differences in two areas.

“This is a part of the brain you do not want to mess around with,” study leader Hans Breiter said. Read more at USA Today.

{Andy Newscenter}


  1. Or is it that brain abnormalities incline one to use marijuana? That is the problem with correlations. Which is the cause and which is the effect? Or are they both the result of a third, unidentified factor? Correlations are a good starting point and a justification for serious study but can never be the final conclusion of an issue. The only way to prove that Marijuana causes brain changes would be to scan the brains of people who have never used it, have them use it for a significant period of time and then do another scan. Only then would it be reasonable to say that the marijuana causes the brain changes.

  2. Three cheers for Aryeh, the first poster on the site I have read who actually understands statistics and the scientific method. Correlations do not prove causality, as all four of my statistics professors told us over and over again.

    Another factor to consider is the brain is not a machine – it’s alive and it changes constantly. It also differs in physical form and function from one person to another. (Ask anyone who has attended brain surgery how difficult it is for the surgeon to find his way around the living brain in front of him, which may bear no close correspondence to all those lovely illustrations in the med books.)

    And if you’re worried about brain changes – check out the ones that occur with some of our commonly prescribed prescription drugs, like Prozac or Ritalin.


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