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What causes the effects of cannabis?

What causes the effects of cannabis?

The cannabis flower produces chemicals called "cannabinoids," which include tetrahydrocannabinol (THC) and cannabidiol (CBD), and other chemicals called terpenes (which add flavour) and flavonoids (which add colour). It is thought that all of these chemicals work together in the body to create what scientists call an "entourage effect." This effect is present in dried cannabis, and in cannabis oil that maintains a full cannabinoid and terpene profile.

THC molecule
CBD molecule