Marijuana can enter the body in a number of ways. It can be smoked, ingested through food, inhaled through vapor, or steeped as a tea, and the way marijuana enters the body can impact the type of effects a person experiences. Smoking pot causes the substance to enter the bloodstream directly, while oral consumption is first processed in the liver. Some studies indicate that when THC is taken by mouth, a substance is then produced in the liver that can alter mood or consciousness. There are also derivatives of the plant, like delta-9-tetrahydrocannabinol (THC) and other cannabinoids (chemical components of the cannabis plant), which can be extracted and taken on their own.