Marijuana is a plant containing a psychoactive chemical, tetrahydrocannabinol (THC), in its leaves, buds and flowers. Marijuana is the most commonly used illicit drug, with forty-two percent of American adults reporting that they have used it.
Despite the fact that marijuana’s effects are less harmful than those of most other drugs, including alcohol and tobacco, it is the most common drug that people are arrested for possessing. U.S. marijuana policy is unique among American criminal laws in being enforced so widely and harshly, yet deemed unnecessary by such a substantial portion of the population.