Via PBS News Hour:
Daily marijuana use has a measurable effect on the brain, a new study finds. Photo by Dean J. Koepfler/Tacoma News Tribune/MCT via Getty Images.
Teenagers who smoked marijuana daily for three years performed poorly on memory tasks and showed abnormal changes in brain structure, according to a Northwestern Medicine study. Researchers in Chicago observed the brains of teenagers who were heavy users of marijuana. In those individuals, memory-related structures in the brain appeared to shrink and collapse inward, possibly indicating a decrease in neurons.
These abnormalities were recorded two y...