Study: Medical Marijuana Use Doubled Between 2013 and 2020

The use of medical marijuana in the United States more than doubled between the 7-year period of 2013 to 2020.

The study, published in the American Journal of Preventive Medicine, notes that cannabis use for medical purposes is legalized across 39 states and the District of Columbia. The objective “was to evaluate temporal trends and correlates of cannabis use for medical purposes in the US.” The study was conducted by researchers at Yale School of Medicine, the Connecticut Healthcare System and the University of Connecticut School of Medicine.

The study found that the prevalence of U.S. residents using cannabis for medical purposes “increased significantly from 1.2% in 2013-2014 to 2.5% in 2019-2020.”

For the study data from 2013-2020 National Survey on Drug Use and Health (NSDUH) were used.

“Since 2013, medical cannabis use has been assessed using a dichotomous question asking whether any medical cannabis use was recommended by a doctor among those who used cannabis in the past 12 months”, states the study. “A modified Poisson model was used to estimate the average annual percent change (AAPC) of medical cannabis use from 2013 to 2020.” The analyses were repeated for key socio-demographic and clinical subgroups. Data were analyzed from September to November, 2022.

“The prevalence of US residents using cannabis for medical purposes increased significantly from 1.2% in 2013-2014 to 2.5% in 2019-2020, with an AAPC of 12.9% (95% confidence interval [CI], 10.4-15.5%), and many of socio-demographic and clinical subgroups showed similar significant increases in cannabis use for medical purposes”, states the study. “In the multivariable-adjusted model, living in a state that legalized medical cannabis remained significantly associated with medical cannabis use.”

Researchers conclude by stating that “The study documents a continued nationwide increase in use of cannabis for diverse medical purposes between 2013 and 2020, two decades after the first state passed legalizing legislation.”

The full text of the study can be found by clicking here.
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