Marijuana, also known as cannabis, is a psychoactive drug derived from the Cannabis plant. It contains over 100 chemical compounds known as cannabinoids, including delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD). Marijuana is commonly used for its euphoric and relaxing effects and has been used for medicinal and recreational purposes for thousands of years. However, its use is also associated with various short-term and long-term health risks, including impaired memory and concentration, impaired coordination, anxiety, depression, addiction, and respiratory problems. Marijuana use can also have adverse effects on mental health, especially in individuals with a predisposition to mental illness, such as schizophrenia. Despite its potential risks, marijuana has been legalized for medical and/or recreational use in several countries and states. The legality and regulation of marijuana use vary widely by jurisdiction.