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Actually, the answer to the question should be quite clear... smoking gives pleasure, and people often prefer short term pleasure over long term benefits. Smoking may kill you, but that's not likely to happen in the next few decades. Meanwhile, the pleasure is instantaneous.
The same goes for eating unhealthy food, drinking, wasting money on porn and lapdances instead of investing it, wasting time playing video games, watching tv instead of working out, etc.
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