Researchers at the University of Colorado-Boulder looked at more than 850 adults and 430 teenagers to find that alcohol, but not marijuana, led to lower brain volumes of grey and white brain tissue.
Grey matter controls brain function and white matter controls communication between the nerves in the brain.
Any reduction in volume could lead to lead to impaired function but that decreased volume was not observed in participants who only consumed the drug.
“While marijuana may also have some negative consequences, it definitely is nowhere near the negative consequences of alcohol,” study co-author Kent Hutchison told Medical News Today.
However, study author Rachel Thayer warned that there is still a lot scientists do not know about how marijuana affects the human brain as