Could it be that the cannabinoid network is precisely the sort of adaptation that natural selection would favor in the evolution of a creature who survives by hunting? A brain chemical that sharpens the senses, narrows your mental focus, allows you to forget everything extraneous to the task at hand {including physical discomfort and the passage of time}, and makes you hungry would seem to be the perfect pharmacological tool for man the hunter. All at once it provides the motive, the reward, and the optimal mind-set for hunting.
( Michael Pollan )
[ The Omnivore's Dilemma: A ]
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