1 would also anticipate finding at the very least an innate (i.e. not induced immediately from the drug but e.g. via the anticipation to it) dopamine response to opioid administration in opioid addicts. Alas, whilst a person is present in animal models (and It is really lower than for psychostimulants), https://franciscoqftet.ageeksblog.com/37910415/the-greatest-guide-to-4-methylaminorex