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Your assignment is to prepare and submit a paper on does smoking cause lung cancer. It is much easier to consider the problem from an epidemiological point of view. It is enough to prove that the risk of developing lung cancer in the population of smokers is significantly higher than that in the population of non-smokers. In this respect, we need to define the population of smokers. Naturally, an effect of smoking in the population who have been smoking more than a pack of cigarettes for the last 20 years is much more than the effect of smoking in a population who smoke at most 3 cigarettes a day for last five years. The probability of developing lung cancer is expected to be more in the former group than in the latter. Let us consider the population of longtime smokers. e.g. the population consists of males or females who have been smoking more than a pack of cigarettes for the last 20 years or more.
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