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I think the chance of a psychedelic drug becoming addictive is very slim. The experiences are just too intense to handle on a regular basis.
Before Europeans started farming ten thousand years ago, our ancestors were all hunter-gatherers. When the transition began from a low-carb hunter-gatherer diet to high-carb farmers' diets, the human digestive system had to change as well. The problem is that the Celtic peoples remained herders (cowboys), which is close to hunter/gatherer, until very recently whereas Germanic and Mediterranean peoples have been farming for many thousands of years.What this means for purposes of our discussion is that the ability to drink alcohol responsibly came with having the farmers' digestive system (farmers tended to consume huge quantities of beer and wine as food whereas herdsmen did not); those with the old Celtic herder digestive systems tend not to be able to handle alcohol as well. For example, since the American South is filled with Celts, the South had, and still has, relatively strict alcohol laws. This also explains why African Americans, and particularly Indians, suffer much higher rates of alcoholism than whites or east Asians. Whites and east Asians have been farming much longer, and have a much greater chance of having the farmer's digestive system, which tends to handle alcohol better. Of course, this theory doesn't explain other addictions.
A study I read conducted by the FBI showed that 99% of men convicted of domestic violence were never violent in past or future relationships. It was just THAT particular relationship that got them in trouble.