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The receptors they fit are different ones. Heroin, unfortunately, fits some of the receptors that govern involuntary functions, which is why it's so dangerous and why overdose results in death. THC fits the receptors for a set of brain chemicals known as anandamides, so well that I think they are starting to call them "cannabinoid receptors" ...and does not attach to receptors that control involuntary activity, which is why overdose is safe and only results in sleep.
Chocolate also contains anandamides. They figure they control memory, and bliss.
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