I do not know how much a propensity to addiction is "hardwired" or how much it depends on circumstances or state of mind. All I know is that I was hooked after that night with an amphetamine-soaked joint and was to remain hooked for the next four years. In the thrall of amphetamines, sleep was impossible, food was neglected, and everything was subordinated to the stimulation of the pleasure centers in my brain.
( Oliver Sacks )
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