Avoiding every risk to increase longevity. Is it worth it?

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I read this piece of news somewhere that watching tv reduces one's life span but was not deterred one bit. If we were to avoid those things that would reduce longevity I wonder if it is worth living at all. There are so many things listed that can reduce our life span but we go about doing exactly what we want to do. Life is for living and not keeping it locked somewhere. Those who smoke and those who drink are fully aware of what that does to their health but continue nevertheless. And what about those who perform trapeze acts where the risk of losing a life is the greatest. But they do it all the same. On the one hand we are warned and yet on the other opportunities are created relentlessly that could reduce our life span. Life goes on