Marijuana is an herb that has a very complex structure. It contains more than 400 cannabinoids that are responsible for making a marijuana smoker feel high. The most important cannabinoid of all is called the THC and it is the primary active ingredient in the substance.  What happens when these cannabinoids find their way to the brain? THC is able to copy the activities of the anandamide isone, which is a cannabinoid that is found in the brain. When THC successfully binds itself with the ...