Abstaining from cannabis for a month can boost the memory performance of regular users, according to a study of young people who used the drug at least once a week.
Researchers found that four weeks without cannabis led to a “modest but reliable” improvement in users’ memory test scores, which could be sufficient to raise students’ grades at school.
“We can strongly say that regular users will learn better when they abstain, and continuing to use the drug is likely to negatively impact the learning process,” said Randi Schuster at Massachusetts General Hospital’s Center for Addiction Medicine in Boston.
The scientists recruited 88 participants aged 16 to 25, all of whom used cannabis at least once a week. Each was then randomly assigned to one of two groups. The first continued their drug use as before, while the second agreed to quit for 28 days. All gave regular urine samples to