Before the 1960s, many Americans had never heard of marijuana, but today it is the most often used illegal drug in this country.
Cannabis is a term that refers to marijuana and other drugs made from the same plant.
There are about 400 chemicals in a cannabis plant, but THC is the one that affects the brain the most. There are stronger forms of marijuana available today than there were in the 1960s. The strength of the drug is measured by the amount of average THC in test samples confiscated by law enforcement agencies. Hash oil, a tar-like liquid distilled from hashish, has an average of 16 percent, with a range as high as 43 percent. Inc. Other trademarks property of their respective holders.