The actual story behind the legislature passed against marijuana is quite surprising. According to Jack Herer, author of The Emperor Wears No Clothes and an expert on the "hemp conspiracy," the acts bringing about the demise of hemp were part of a large conspiracy involving DuPont, Harry J. Anslinger, commissioner of the Federal Bureau of Narcotics, and many other influential industrial leaders such as William Randolph Hearst and Andrew Mellon. Herer notes that the Marijuana Tax Act, which passed in 1937, coincidentally occurred just as the decoricator machine was invented. With this invention, hemp would have been able to take over competing industries almost instantaneously. According to Popular Mechanics, "10,000 acres devoted to hemp will produce as much paper as 40,000 acres of average [forest] pulp land." William Hearst owned enormous timber acreage, land best suited for conventional pulp, so his interest in preventing the growth of hemp can be easily explained. Competition from hemp would have easily driven the Hearst paper-manufacturing company out of business and significantly lowered the value of his land. Herer even suggests popularizing the term "marijuana" was a strategy Hearst used in order to create fear in the American public. "The first step in creating hysteria was to introduce the element of fear of the unknown by using a word that no one had ever heard of before... 'marijuana'" (ibid).
DuPont's involvment in the anti-hemp campaign can also be explained with great ease. At this time, DuPont was patenting a new sulfuric acid process for producing wood-pulp paper. "According to the company's own records, wood-pulp products ultimately accounted for more than 80% of all DuPont's railroad car loadings for the next 50 years" (ibid). Indeed it should be noted that "two years before the prohibitive hemp tax in 1937, DuPont developed a new synthetic fiber, nylon, which was an ideal substitute for hemp rope" (Hartsell). The year after the tax was passed DuPont came out with rayon, which would have been unable to compete with the strength of hemp fiber or its economical process of manufacturing. "DuPont's point man was none other than Harry Anslinger...who was appointed to the FBN by Treasury Secretary Andrew MEllon, who was also chairman of the Mellon Bank, DuPont's chief financial backer. Anslinger's relationship to Mellon wasn't just political, he was also married to Mellon's niece" (Hartsell). It doesn't take much to draw a connection between DuPont, Anslinger, and Mellon, and it's obvious that all of these groups, including Hearst, had strong motivation to prevent the growth of the hemp industry.
The reasoning behind DuPont, Anslinger, and Hearst was not for any moral or health related issues. They fought to prevent the growth of this new industry so they wouldn't go bankrupt. In fact, the American Medical Association tried to argue for the medical benefits of hemp. Marijuana is actually less dangerous than alcohol, cigarettes, and even most over-the-counter medicines or prescriptions. According to Francis J. Young, the DEA's administrative judge, "nearly all medicines have toxicm, potentially letal affects, but marijuana is not such a substance...Marijuana, in its natural form, is one of the safest therapeutically active substances known to man. By any measure of rational analysis marijuana can be safely used within a supervised routine of medical care" (DEA Docket No. 86-22, 57). It is illogical then, for marijuana to be illegal in the United States when "alcohol poisoning is a significant cause of death in this country" and "approximately 400,000 premature deaths are attributed to cigarettes annually." Dr. Roger Pertwee, SEcretary of the International Cannabis Research Society states that as a recreational drug, "Marijuana compares favourably to nicotine, alcohol, and even caffeine." Under extreme amounts of alcohol a person will experience an "inability to stand or walk without help, stupor and near unconsciousness, lack of comprehension of what is seen or heard, shock, and breathing and heartbeat may stop." Even though these effects occur only under insane amounts of alcohol consumption, (.2-.5 BAL) the fact is smoking extreme amounts of marijuana will do nothing more than put you to sleep, whereas drinking excessive amounts of alcohol will kill you.
Cut and pasted without the kind permission of Erowid