Check this out. They showed, in the 70s(!), that rats stop consuming opioids when the source of emotional pain is gone. https://en.wikipedia.org/wiki/Rat_park

Check this out. They showed, in the 70s(!), that rats stop consuming opioids when the source of emotional pain is gone. https://en.wikipedia.org/wiki/Rat_park https://en.wikipedia.org/wiki/Rat_park