Yes, THC is a Cannabinoid
Δ9-tetrahydrocannabinol (THC) is definitively a cannabinoid—specifically, it is the primary psychoactive phytocannabinoid (plant-based cannabinoid) found in the Cannabis sativa plant. 1, 2
Classification and Definition
Cannabinoids are compounds that interact with endocannabinoid receptors throughout the central and peripheral nervous system, on immune cells and organs, and elsewhere in the body. 1 They can be categorized into three main types:
- Endocannabinoids: Naturally produced within the body 1
- Phytocannabinoids: Plant-derived compounds from cannabis, including THC 1, 2
- Synthetic cannabinoids: Laboratory-created analogues 1
THC as a Phytocannabinoid
THC (delta-9-tetrahydrocannabinol) is recognized as one of the two most studied cannabinoids, alongside cannabidiol (CBD). 1 The American College of Physicians explicitly identifies THC as a cannabinoid with psychoactive effects, distinguishing it from CBD which produces psychoactive effects but does not induce euphoria. 2
The cannabis plant contains hundreds of bioactive compounds, including dozens of phytocannabinoids beyond just THC, as well as phenols and terpenes. 1 Other notable cannabinoids include:
Pharmacological Properties
THC is well-recognized for its mind-altering effects including euphoria, relaxation, amplified sensory experience, and altered perception of time. 1 It exerts these effects through activation of G-protein-coupled cannabinoid receptors in the brain and peripheral tissues. 6
THC is metabolized into active and inactive metabolites that are themselves cannabinoids, including 11-hydroxy-Δ9-tetrahydrocannabinol (11-OH-THC) and 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THCCOOH). 7, 4, 3 Research demonstrates that 11-OH-THC displays equal or greater activity than the parent compound THC. 7
Legal and Regulatory Context
Under federal law, the Cannabis sativa plant and all parts containing more than 0.3% THC are defined as marijuana, while plants with no more than 0.3% THC are classified as hemp. 2 THC remains a Schedule I controlled substance at the federal level, though 38 states have legalized medical cannabis use as of 2023. 1, 2