Terpenes and Terpenoids
The most commonly recognized terpene that affects the CB2 receptors is beta-Caryophyllene, which is found in pepper, cloves, and other spices. Terpenes are hydrocarbons. There are thousands of different terpenes found in the plant kingdom, but to date, only a few have been shown to influence the endocannabinoid system.
Cannabinoids like THC and CBD are created in the plant from terpene units.