對大麻問題有興趣的話，可上Wikipedia查看；其中引述的一篇文章最為有趣：Development of a rational scale to assess the harm of drugs of potential misuse（登記後可免費閱讀全文）。
小約翰‧洛克菲勒（John D. Rockefeller, Jr.）解說甚妙：
“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."
Letter on Prohibition – see Daniel Okrent, Great Fortune: The Epic of Rockefeller Center, New York: Viking Press, 2003. (pp.246/7).