Delta 9/THC

THC stands for delta-9-tetrahydrocannabinol or Δ-9-tetrahydrocannabinol (Δ-9-THC). It is a cannabinoid molecule in marijuana (cannabis) that's long been recognized as the main psychoactive ingredient—that is, the substance that causes people who use marijuana to feel high.

THC is just one of more than 400 different active substances—and 60 different cannabinoid molecules—contained in marijuana, although THC is the most recognized. Another important cannabinoid molecule that has received major interest is cannabidiol (CBD).1

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