When marijuana was outlawed and eventually placed as a Schedule 1 drug in the 20th century, the primary propaganda used to help ban the weed was a combination of racism, fearmongering by certain members of the government, and of course, corporate America.
The main villain who would become the father of the eventual 'war on drugs' was Harry Anslinger, an assistant Prohibition commissioner and then commissioner of the Federal Bureau of Narcotics from 1930 to 1962. Anslinger would use all means of vilification to both deter use, and eventually become successful in banning pot by portraying minorities as the only ones using the drug. And of course as a bonus, this fit in perfectly with agendas of corporations who wanted pot and its brother hemp eliminated from society.
"There are 100,000 total marijuana smokers in the U.S.," Anslinger might say, "and most are Negroes, Hispanics, Filipinos and entertainers. Their Satanic music, jazz and swing, result from marijuana use. This marijuana causes white women to seek sexual relations with Negroes, entertainers and any others."
Actually, Anslinger did say that, and much more. With the help of the federal government, the states, DuPont, pharmaceutical companies and the Hearst newspaper chain, Anslinger sought to keep the heartbeat of Puritanism alive. He was the assistant Prohibition commissioner and then commissioner of the Federal Bureau of Narcotics from 1930 to 1962. - Mapinc
Medical studies have now overwhelmingly shown that the medicinal benefits of marijuana outweigh the side effects that using pot may incur, especially if distilled into forms other than as a joint to smoke. And while it took nearly two decades to get this information out to where enough of the public was open to accepting and demanding its legalization, the war on this drug continues even today thanks to the one industry that is spending 100's of millions of dollars to keep it out of people's hands.