Teen use and perceptions of marijuana change after legalization, US study finds

A study out of the University of California, Davis has provided new insights into how marijuana legalization affects teenagers' perceptions and use of the drug.

Researchers found that among Grade 8 and 10 students in Washington State, marijuana use increased after the drug was legalized. 

Attitudes were also affected. The study's findings showed teenagers were less concerned about the harms associated with marijuana after the law changed.

Results varied among slightly older students. Among Grade 12 students, no shift in attitude or use was reported.

In Colorado, where marijuana was legalized in 2012, the study's results were also different. Researchers found no change in attitude or use of marijuana after legalization — for any age group.

Lead researcher Magdalena Cerda said she believes the changes in attitudes and frequency of use are directly linked.

"It could be a combination of things that led to the increase in use among adolescents — but likely any change of...

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