The drug usually referred to as marijuana is cannabis. It is a type of plant that is grown for its flowers, leaves, and stems, which contain a chemical called delta-9-tetrahydrocannabinol (THC). When this chemical is smoked, vaporized, or consumed in food or drinks, it can produce a range of effects, including feelings of relaxation, euphoria, and altered perceptions of time and space. Some people also use cannabis for medicinal purposes, such as to relieve pain, reduce inflammation, and improve sleep. However, it is important to note that cannabis can also have negative effects, such as impaired memory, coordination, and judgment, and it can also be addictive for some people.