Teens don't have to use weed all that often for it to have a negative effect on their lives, according to a new study.
Even using marijuana once or twice a month is linked with worse school performance and more emotional turmoil among teenagers, researchers reported Tuesday in the journal Pediatrics.
And more frequent use brings on even more emotional and academic problems, researchers found.
"Our study found that any amount of cannabis use at all may put kids at risk of falling behind in school, and the kids using most often may have the greatest risk," said lead researcher Dr. Ryan Sultan, an assistant professor of clinical psychiatry at Columbia University.
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