A Landmark Study on the Origins of Alcoholism
Many lab studies treat animals as if they were identical, and any variation in their behavior is just unhelpful noise. But in Augier’s work, the variation is the important bit. It’s what points to the interesting underlying biology. “This is a really good study,” says Michael Taffe, a neuroscientist at the Scripps Research Institute who studies drug addiction. “Since only a minority of humans experience a transition to addiction, [an approach] such as this is most likely to identify the specific genetic variants that convey risk.”
That is exactly what the team did next. They compared the alcohol-preferring and sugar-preferring rats and looked for differences in the genes that were active in their brains. They focused on six regions that are thought to be involved in addiction, and found no differences in five. “But in the sixth, we did,” says Heilig. “And it made me smile because I started out doing my Ph.D. on the amygdala.”
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This is a well written article, well worth the read. It explains what is certainly one biochemical difference contributing to addiction and will possibly apply to other addictions.
I've always thought four things about true addiction: it's hard wired, it's rare, most of it stems from self medication, and it's different from dependency.
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I'm a member of a 12 step program and certainly knew once I sipped my first drink, I was already thinking of the next one...………. 
Inch by inch, life's a cinch! 
