The common idea that DNA determines so much of who we are—not only our eye or hair color, for example, but also our addictions, disorders, or susceptibility to cancer—is a misconception.

You find yourself to be more or less a victim of your heredity. The problem with that belief system is that it extends to another level … You become irresponsible. [You say,] ‘I can’t do anything about it, so why try?’

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