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Just as some people will wander aimlessly from the start of their career to the end letting the world push them to where-ever they end up, possibly more people take the same approach with their health. I'm not saying that there's anything wrong with that, it's your life, do shat make you happy - just be prepared to reap the consequences of you actions good or bad.
Looking at physics, chemistry, and pretty much any other science (hell, look beyond science and you'll find the same!), every action has