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Yes, in fact, ex-smokers say that they sleep more deeply after quitting

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In the recent past, there have been several instances where human ingenuity has been applied to reduce the complex causes of environmental damage

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Thus, the SIR represents lung cancer deaths caused solely by smoking: where C is the age-specific lung cancer death rate of the observed population, S is the lung cancer death rate of reference smokers from the ACS-CPS II (see appendix in ref