Hemp prohibition is the result of propaganda by the petrochemical, cotton, and wood-based paper industries, who foresaw competition from hemp. Virtually anything that can be made from petroleum can be made from hempseed and other vegetable oils at a much lesser cost, and hemp fiber is many times more durable and resourceful than cotton or wood-based paper.

A number of social problems resulted from the Prohibition era. A profitable and violent black market for alcohol flourished. Powerful gangs corrupted law enforcement agencies, and stronger liquor surged in popularity because its potency made it more profitable to smuggle. Enforcing prohibition had an enormous price tag, and the absence of almost $500 million annual nationwide tax revenues on alcohol affected the government's financial resources. When repeal of prohibition occurred in 1933, organized crime lost nearly all of its black market alcohol profits in most states because of competition with low-priced alcohol sales at legal liquor stores.

At the end of prohibition some of the initial supporters openly admitted its failure. A quote from a letter, written in 1932 by wealthy industrialist John D. Rockefeller, Jr., states:

When Prohibition was introduced, I hoped that it would be widely supported by public opinion and the day would soon come when the evil effects of alcohol would be recognized. I have slowly and reluctantly come to believe that this has not been the result. Instead, drinking has generally increased; the speakeasy has replaced the saloon; a vast army of lawbreakers has appeared; many of our best citizens have openly ignored Prohibition; respect for the law has been greatly lessened; and crime has increased to a level never seen before.”

Sponsored by the American Civil Liberties Union and featuring noted travel writer and television host Rick Steves, "Marijuana: It's Time for a Conversation" begins a long-overdue public discussion about marijuana and marijuana prohibition.

Source: http://www.marijuanaconversation.org/interviews/

http://www.marijuanaconversation.org/start-a-conversation/