What's it going to cost you?
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A one-in-a-million chance of dying.
For sudden, one-off risks. A skydive is about 8. Driving 370 km is about 1.
Thirty minutes of life expectancy.
For slow, daily habits. Two cigarettes cost one. Twenty minutes of exercise earns two.
The odds × the years you have left.
The odds are the same for everyone; the stake isn't. A skydive at 45 costs about 2 hours of life, on average. The older you are, the cheaper the same thrill.
Known risks, with sources. Approximate averages from studies and national statistics; estimates are marked. Your mileage will vary, literally.