The trouble is everyone in their right mind knows pretty well how to live a life that will maximise their years on this planet.

(Not withstanding those occasions when the fittest person in the avenue drops dead when out jogging)

But the thing is, a lot of people don't want a safe, sensible long life. They want to take a risk.

That risk might be smoking, a dangerous sport, drinking too much, or it might be gambling.

Now this might be stupid, but we evolved to survive in a risky environment, and that's where we do best.

I'm not advocating smoking or taking drugs or doing wheelies down your local street, but that's one of the reasons that people do it.