Study finds marijuana has no effect on teen brain tissue, unlike alcohol use
Researchers at UC San Diego and the University of Pittsburgh announced the results of a study that regular marijuana use doesn’t damage brain tissue, while routine drinking does.
The brains of 92 young people — ages 16 to 20 — were scanned by UC San Diego researchers over 18 months. The participants with histories of alcohol and marijuana use, about half, continued using. The other half abstained or maintained minimal use. The study observed physical brain tissue, not overall performance of the participants.
The before-and-after scans showed that teens drinking at least 5 drinks per week had reduced brain tissue health — possibly leading to declines in attention span, memory and decision-making. The brain tissue of teens who used only marijuana up to 9 times per week showed no physical damage. Read more