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There’s a difference between having lung cancer (an issue) and living in a way that increases the probability of contracting lung cancer (risk). The former requires treatment, the later requires actions to lower the probability. Some of these mitigations are exercising, increasing intake of healthy food, or quitting smoking. However, we all know people who smoke, don’t exercise, or consistently eat one too many desserts despite knowing the risks. Irrational? Yes. Explainable? Largely.