What is THC (Delta-9-Tetrahydrocannabinol)?

“Delta-9-tetrahydrocannabinol (Delta-9-THC) is the primary psychoactive ingredient [in marijuana]; depending on the particular plant, either THC or cannabidiol is the most abundant cannabinoid in marijuana.”

http://medicalmarijuana.procon.org/view.answers.php?questionID=000637

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