is a person sad, or is a person just lacking dopamine? if we can make person happy with chemicals (and it's pretty well established that we can) what's the dif

is a person sad, or is a person just lacking dopamine? if we can make person happy with chemicals (and it's pretty well established that we can) what's the difference between happiness from consciousness and happiness from chemicals? the location of the producing glands? so if we add "happiness" glands to the machine and train the machine to maximize it's production, is it conscious now?