A massive new study sheds light on how cannabis affects the brain, particularly during cognitive tasks. Researchers analyzed over 1,000 young adults and found that both heavy lifetime use and recent cannabis consumption significantly reduced brain activity during working memory tasks.

Heavy cannabis use may negatively impact a person’s working memory, according to the largest study on this subject to date.

33,530 people played the daily Crossword recently. Can you solve it faster than others?33,530 people played the daily Crossword recently. Can you solve it faster than others?

New research shows that heavy lifetime use of cannabis — more than 1,000 times — is associated with reduced activity in areas of the brain involved in working memory. The study adds to existing research suggesting that frequent cannabis use may affect certain thinking skills.