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For a species wired for survival, we have an odd habit of getting hooked on things that can kill us new research is revealing why – and opening the door to the long-dreamed-of cure

In the brains of addicts, there is reduced activity in the prefrontal cortex, where rational thought can override impulsive behavior.

Addictions occur when behaviors start to become excessive. They are driven by our systems that stand up, shake us, “the brain is saying this is good; we should do it again.”

· Summarized of TIME, July 16, 2007