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Marathon runners will usually drink energy drinks like Boost. They may also eat an energy bar. Also the night before, they usually will eat spaghetti - as it supplies the energy and proteins an athlete needs before a race.
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Not exactly, it depends which person has a better stamina or a stronger runner. During the olympics, the winners for running are mostly shorter than tallest person, which came in last. So it really depend on the individual.
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Yes you can die from smoking. Even though you only smoke once, the ash from the cigarettes will go into your lungs and when it stays there long enough it will start developing into cancer. Once it has developed, it will start eating into your lungs and cause lung cancer, resulting in death.