Why is marijuana placed into a drug classification of its own?

it a class b drug because it a drug that people can get addicted cannabis

, also known as marijuana[2] (from the Mexican Spanish marihuana), and by other names,a[›] is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine.[3][4][5] Pharmacologically, the principal psychoactive constituent of cannabis is tetrahydrocannabinol (THC); it is one of 483 known compounds in the plant,[6][7] including at least 84 other cannabinoids, such as cannabidiol (CBD),