The Marihuana Tax Act of 1937 was drafted by infamous anti-cannabis prohibitionist Harry Anslinger, and signed into law on August 2, 1937.

Up until this law was passed, cannabis products were legal to sell in pharmacies and drug stores, so long as they were properly labeled and regulated, but it was during the 1930s that the mainstream attitudes towards cannabis began to sway greatly towards negative opinion.

In honor of the 80th anniversary of the first official federal prohibitory measure on cannabis in the United States, we explore some of the reasons why the Marihuana Tax Act of 1937 changed the history of cannabis.

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Lisa Rough ~ Leafly.com ~