The volume of studies on cannabis has “grown steeply” over the past couple of decades as more U.S. states and countries around the world have moved to end prohibition, a new research analysis concludes.

That’s in spite of the fact that U.S. federal policy has severely encumbered scientists from obtaining and studying the plant due to its ongoing status as a Schedule I drug under the Controlled Substances Act (CSA).

The new study, published last week in the Journal of Cannabis Research, provides an in-depth breakdown of the scientific literature on cannabis that has expanded over time despite those barriers.

The researchers were able to identify nearly 30,000 cannabis-related studies that have been published in 5,474 journals from 1829 to 2021. “Since the 1960s, an upward trend with respect to the volume of publication can be observed, with 2020 marking the year with the most publications,” the authors said. 

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