Alcohol damages the brain more than cannabis, new research suggests.
Unlike booze, marijuana does not affect the size or integrity of white or grey matter in the brain, even after years of exposure, a study found.
Grey matter enables the brain to function, while white controls communication between nerve clusters.
Study author Professor Kent Hutchison from the University of Colorado Boulder, said: ‘While marijuana may also have some negative consequences, it definitely is nowhere near the negative consequences of alcohol.’
The scientists add, however, research into cannabis’ mental effects are still very limited.
Lead author Rachel Thayer said: ‘Particularly with marijuana use, there is still so much that we don’t know about how it impacts the brain.’
In the US, 44 percent of those aged 12 or over have used cannabis at some point in their lives.
Washington, Oregon, California, Alaska and Colorado have legalised marijuana for medical or recreational use.