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  • Mortality of Smokers and Nonsmokers
    two variables does not necessarily prove that a direct causal relationship exists between them. This ... been persuaded to smoke ciga- rettes, there is no direct evidence of the effects which cigarette smoking ...

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    • Authors: William J November, E Cuyler Hammond, Robert C Hockett, W Harding Le Riche
    • Date: Jan 1964
    • Competency: External Forces & Industry Knowledge
    • Publication Name: Transactions of the SOA
    • Topics: Experience Studies & Data>Mortality