What is the brain chemistry trailing smoking marjiuana?

I was asked a interrogate about marjiuana on how the chemistry of the brain in fact works when some one smokes. Not so much the effect of it, but more so the science behind it. Hope this make sense.What is the brain chemistry trailing smoking marjiuana?
The active chemical contained by marijuana, tetrahydrocannabinol, or more commonly THC, takes the place of instinctive chemicals in the brain. The primary differences between these chemicals is that THC is longer enduring, and is not taken back into the system through deactivation and neural re-uptake.
The deep function of these chemicals is to flood the brain with dopamine, by neutralize the inhibitors which stop it's production and telling the brain to release as much of it as possible. (This is why it help those with Parkinsons.)
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