An impressive 80 percent of Americans favoured legalising medical marijuana, a 2002 Time magazine poll revealed. Artists and writers were regular users of marijuana in the early 20th century for the purpose of stimulating creativity. By the mid-1920s, the American media had latched on to the idea that marijuana and crime, both violent and sexual, were related. At this point, it is very clear that it is not valid at all, but then even without any evidence to back up the fallacy, all states had legislation governing the use of marijuana by the 1930s.You may find more details about this at CBD Oil for Pain
At the time, Harry Anslinger, Commissioner of Drugs, crusaded in front of Congress against marijuana, the medical establishment, and the media warning against its risks to society. As a consequence, legislative hearings followed in 1937, with the outcome becoming the 1937 Marijuana Tax Act. This did not make marijuana illegal, but created a hefty tax structure (cultivation, distribution, sale) around any step of the marijuana cycle. The onerous aspect of the Act has driven the use of marijuana to a marginal amount.
Finally, studies started to show that marijuana was relatively harmless compared to hard drugs such as cocaine and heroin in the 1940s. In tandem with marijuana, the correlation with aggression was refuted and understood to be most likely due to the alcohol consumed. However, despite a growing body of studies showing that it was relatively (not entirely) harmless, the general public saw it as harmful with the legal framework imposed around marijuana.
The use of marijuana increased during the 1950s and 60s, but studies focused more on LSD and other hard drugs. By 1970, the National Institute of Mental Health estimated that marijuana had been used at least once by 20 million Americans. In 1970, a Gallup survey found that marijuana was smoked by 42 percent of college students.