+**D9** (Delta-9-tetrahydrocannabinol) is the principal psychoactive [Cannabinoid](/wiki/Cannabinoid) found in the [Cannabis plant](/wiki/Cannabis_plant). It is largely responsible for the plant's characteristic effects. Its chemical structure and interaction with the body's systems remain a focus of scientific inquiry.
+## See also
+- [THC](/wiki/THC)
+- [Marijuana](/wiki/Marijuana)
+- [Psychoactive Drug](/wiki/Psychoactive_Drug)
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