THC is a psychoactive substance. THC can be used as medicine as well. THC is extracted from the cannabis plant. It is the crystals on the buds of the cannabis plant that contains the highest concentration of THC. THC can be consumed in many ways.
Often people will smoke the cannabis, but it can be used in a different variety of food in order to achieve the effect of THC. Depending on which variety of cannabis the consumer wants to obtain, the effect can be varying.