If there was no inhereted trait that predisposes groups of people to addiction then it wouldn't "run in the family." Alcoholism is rampant among Native Americans. You'd have to completely ignore that fact in order to conclude that there is no inhereted trait.
Ok, but, now we're really getting in the deep grass here and this is the fun stuff DNA man was getting into. Look at what that is saying:
Scientists estimate that genetic factors account for between 40 and 60 percent of a person’s vulnerability to addiction; this includes the effects of environmental factors on the function and expression of a person’s genes. A person’s stage of development and other medical conditions they may have are also factors. Adolescents and people with mental disorders are at greater risk of drug abuse and addiction than the general population.
Vulnerability. Effects of environmental factors and expression of gene's. Stage of development.
You take an Native American out of his natural environment at an early age, put him in a busy environment where he is surrounded by people who don't drink much and encourage achievement and responsibility, we'd agree you've made a profoundly positive impact, yes? So, the thing is, can we figure out what switches his old environment typically switch AND what happens in the new environment AND switch them? The argument is that environment has a genetic impact.
Point being to be able to, genetically, reduce or eliminate predisposition to given behaviors and promote others. That opens fascinating, and terrifying, doors.
Another member of the group has animal husbandry in his background and he made the observation of how dumb we are to thing on terms of 'race'. None of us are racists. We are ALL the same race. We are different breeds and, just like dogs, for example, there are different characteristics associated with different breeds. That concept opens more fascinating and terrifying doors.
For those who recoil and suggest that is stepping towards Nazi-esque ideas and thoughts, you gotta step back and consider what they were about; they were not about improving and/or making a better breed. They were about purity, affection and belief in a specific narrow breed. That's the opposite of seeking to breed, say, a dog, a person, who isn't likely to addiction and has better ability to focus and keep to a task.
That's over simplification but, it points the conversation in the right direction. Why WOULDN'T we be interested in knowledge that could lead to, say, naturally stronger hearts, less susceptibility to joint decay, better temperament, better overall health and fitness? I mean, you can take a perfectly fine dog that has room to run, squirrel to chase, the things it needs, genetically, to be a happy animal and change that environment, we see it all the time; anxiety, deterioration of health, bad behaviors, etc.
That leads to two choices; better, more appropriate environments and genetic improvements. One of those is simply not practical on a mass scale; we can't just put everyone where they, genetically, belong, where they'd be healthier and happier.
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