You using the terminology for opioids. Dopamine is a far different process it's actually one in a cascading chain of internal chemical processes that correlate with the urge to survive and procreate and are not causative.
However it is fashionable to think of the human organism as some sort of computer hardware. And act accordingly, trying to hack in. I might not have had as many glimpses of higher Consciousness as someone like
@AutoTripper but only one is sufficient to know that this physical world is very much like the Buddha said an illusion.
However that's not to take anything away from any individual in fact it should hand you and everybody a sense of the awesome responsibility for creating your own reality. However you want to do that is fine by me I'm not judging. But if you think you can reduce it to sub receptor sites well good luck with that one. You may not strike your head on a table corner but you will be banging it against the wall