Prohibition of alcohol ended in 1933 prohibition of pot started in 37'. Effectively giving the Prohibitionist new jobs. William Hurst saw hemp as threat to his giant paper mills. Up until 37' hemp was too hard to separate the fibers to make paper so he had nothing to worry about until the invention of the decordicator.
After that Harry Ansliger and hurst made the movie reffer madness and started a smear campaign with such infamous statements like " the devil weed that makes negros seek relations with white women "
I can go on but
In short the answer would be stupidity.
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