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The legalization of nonmedical cannabis use may be associated with the decreased use of alcohol, cigarettes, and nonprescribed pain relievers among young adults, a team of researchers in Washington state found in a recent study.

To understand how cannabis laws affected the changes in substance use other than cannabis, the researchers assessed a data sample from statewide surveys conducted from 2014 through 2019, totaling 12,694 respondents aged 18 to 25 years.

The researchers found that alcohol use and heavy episodic drinking had decreased, on average, after cannabis legalization. [...]