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Why is it so difficult to understand how people get addicted to gambling? I'm pretty sure it causes observable physiological changes, like increased heart rate

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Name an activity that causes no effects whatsoever on an organism's physiology.

In all fairness, not all activities have the dopaminergic response of gambling.

Agreed, but that's a very different statement from "it causes physiological effects", or even "it raises the heart rate".

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