My two cents
You know the argument that makes absolutely no sense and completely drives me batty? It's the one that runs along the lines of "Stop smoking and you'll live longer" and the immediate response is, "Well, I could get hit by a bus tomorrow and so I should enjoy smoking while I can." I hate this argument because it makes no sense. I mean, a BUS? Why are we all getting hit by buses? And there are things that we all actively do to AVOID getting hit by a bus such as not crossing in front of a moving one, or taking the tunnels or bridges or sidewalks. None of those things mean people won't get hit by a bus, but it just means we decrease the probability of that event happening.
That's the same thing with smoking or any other vice that threatens to short your lifespan in a way a raw-vegetable-and-green-tea-and-excercising-every-day lifestyle won't. Yet for some reasons, we indulge in behaviors that are downright detrimental to our health, such as driving our car* one block instead of walking or eating eight pieces of bacon and 27 hotdogs for dinner every night. We wouldn't step in front of a bus, so why do we persist in behaviors that are completely unhealthy and wrong for us? Admittedly, I get more pleasure out of a piece of cake than I do out of a stalk of celery so maybe that's what it is: we prefer to indulge in our short term pleasure and enjoyment, even if it does shorten our lifespan, instead of living a more austere, deprived life that be a certain percentage longer.
Whatever the reasons are, my point is: the 'hit by a bus tomorrow' argument is really stupid.
*An antidote to high gas prices: Drive less and smaller and walk more.