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Why doesn’t the body do something to keep itself from serious harm like cancer as a result of addiction? The brain/body has the ability to take measures to protect itself from other things like severe cold, or pain. How does the body decide how to protect itself or not?

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Why doesn’t the body do something to keep itself from serious harm like cancer as a result of addiction? The brain/body has the ability to take measures to protect itself from other things like severe cold, or pain. How does the body decide how to protect itself or not?	1