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    Risk of cardiovascular disease from cumulative cigarette use and the impact of smoking intensity

    Access Status
    Fulltext not available
    Authors
    Lubin, J.
    Couper, D.
    Lutsey, P.
    Woodward, M.
    Yatsuya, H.
    Huxley, Rachel
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Lubin, J. and Couper, D. and Lutsey, P. and Woodward, M. and Yatsuya, H. and Huxley, R. 2016. Risk of cardiovascular disease from cumulative cigarette use and the impact of smoking intensity. Epidemiology. 27 (3): pp. 395-404.
    Source Title
    Epidemiology
    DOI
    10.1097/EDE.0000000000000437
    ISSN
    1044-3983
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/41378
    Collection
    • Curtin Research Publications
    Abstract

    BACKGROUND: Relative risks (RR) for cardiovascular disease (CVD) by smoking rate exhibit a concave pattern, with RRs in low rate smokers exceeding a linear extrapolation from higher rate smokers. However, cigarettes/day does not by itself fully characterize smoking-related risks. A reexamination of the concave pattern using a comprehensive representation of smoking may enhance insights. MATERIAL: Data were from the Atherosclerosis Risk in Communities (ARIC) Study, a prospective cohort enrolled in four areas of the U.S. in 1987-89. Follow-up was through 2008. Analyses included 14,233 participants, 245,915 person-years and 3,411 CVD events. RESULTS: The concave RRs with cigarettes/day were consistent with cigarettes/day modifying a linear RR association of pack-years with CVD, i.e., strength of the packyears association depended on cigarettes/day, indicating that the manner of pack-years accrual impacted risk. Smoking fewer cigarettes/day for longer duration was more deleterious than smoking more cigarettes/day for shorter duration (P<0.01). For 50 packyears (365,000 cigarettes), estimated RRs of CVD were 2.1 for accrual at 20 cigarettes/day and 1.6 for accrual at 50 cigarettes/day. Years since smoking cessation did not alter the diminishing strength of association with increasing cigarettes/day. Analyses that accounted for competing risks did not affect findings. CONCLUSION: Pack-years remained the primary determinant of smoking-related CVD risk; however, accrual influenced RRs. For equal pack-years, smoking fewer cigarettes/day for longer duration was more deleterious than smoking more cigarettes/day for shorter duration. This observation provides clues to better understanding the biological mechanisms, and reinforces the importance of cessation rather than smoking less to reduce CVD risk.

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