>>14244972>Why is it that there are things in nature like heroin or tobacco which activate our pleasure systems?Look around you, there are billions of species of plants and animals, each of which contains hundreds of thousands of unique chemicals in them and the human history goes back tens of thousands of years - given all of this, why do you think it is unlikely that some of these chemicals mimic some of our own enough so they are mistaken for them and trigger chemical pathways in the nervous system and the brain, sometimes ones that normally belong to pleasure?
>>14245002Heroin may be human made, but morphine is not, and neither is nicotine.
