Cannabinoids are chemical compounds that activate cannabinoid receptors in the brains of animals. The presence of a cannabinoid receptor in rats has been discovered in 1988. Since then, scientists have proved the existence of such receptors in the cells of mammals, birds, fish and reptiles. Three types of cannabinoids are distinguished by scientists: endocannabinoids, phytocannabinoids and synthetic cannabinoids. I will discuss these three groups of cannabinoids briefly, and will then focus this article on phytocannabinoids and their effect on humans.

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