Okay, you've got the basics on THC, the most dominant psychoactive cannabinoid found in the cannabis plant. And I recently wrote a story all about THC-V, another miracle-working cannabinoid. But have you heard about THC-A and all that it can do? Fresh, raw, living cannabis contains a variety of cannabinoid acids, one of which is called tetrahydrocannabinolic acid or THC-A. Like all cannabinoid acids, THC-A is non-psychoactive. That being said, THC-A is a precursor to its psychoactive cousin THC.