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Disparity and Trends in Secondhand Smoke Exposure among Japanese Employees, Particularly Smokers vs. Non-Smokers

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  • Takahiro Tabuchi
  • Brian Colwell

Abstract

Background: Monitoring disparities in secondhand smoke (SHS) exposure is important for tailoring smoke-free policies to the needs of different groups. We examined disparity and trends in SHS exposure among both nonsmokers and smokers at Japanese workplaces between 2002 and 2012. Methods: A total of 32,940 employees in nationally representative, population-based, repeated cross-sectional surveys in 2002, 2007 and 2012 in Japan was analyzed. Adjusted rate ratios for workplace SHS exposure from other people (“everyday” and “everyday or sometimes”) were calculated according to covariates, using log-binomial regression models with survey weights. In this survey, employees who do not smoke at workplace are defined as workplace-nonsmokers; and those smoke at workplace are used as workplace-smokers. SHS exposure for smokers does not involve their own SHS. Results: While everyday SHS exposure prevalence in workplace-nonsmokers decreased markedly (33.2% to 11.4%), that in workplace-smokers decreased only slightly (63.3% to 55.6%). Workplace-smokers were significantly more likely to report everyday SHS exposure than workplace-nonsmokers, and the degree of association increased over time: compared with the nonsmokers (reference), covariates-adjusted rate ratio (95% confidence interval) for the smokers increased from 1.70 (1.62–1.77) in 2002 to 4.16 (3.79–4.56) in 2012. Similar results were observed for everyday or sometimes SHS exposure. Compared with complete workplace smoking bans, partial and no bans were consistently and significantly associated with high SHS exposure among both nonsmokers and smokers. We also observed disparities in SHS exposure by employee characteristics, such as age group and worksite scale. Conclusions: Although overall SHS exposure decreased among Japanese employees between 2002 and 2012, the SHS exposure disparity between nonsmokers and smokers widened. Because smokers reported more frequent SHS exposure than nonsmokers, subsequent mortality due to SHS exposure may be higher in smokers than in nonsmokers. This information may be useful for advocating workplace smoke-free policies.

Suggested Citation

  • Takahiro Tabuchi & Brian Colwell, 2016. "Disparity and Trends in Secondhand Smoke Exposure among Japanese Employees, Particularly Smokers vs. Non-Smokers," PLOS ONE, Public Library of Science, vol. 11(4), pages 1-12, April.
  • Handle: RePEc:plo:pone00:0152096
    DOI: 10.1371/journal.pone.0152096
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    Cited by:

    1. Genevieve Sansone & Geoffrey T. Fong & Gang Meng & Lorraine V. Craig & Steve S. Xu & Anne C. K. Quah & Janine Ouimet & Yumiko Mochizuki & Itsuro Yoshimi & Takahiro Tabuchi, 2020. "Secondhand Smoke Exposure in Public Places and Support for Smoke-Free Laws in Japan: Findings from the 2018 ITC Japan Survey," IJERPH, MDPI, vol. 17(3), pages 1-10, February.
    2. Sen Zeng & Haruko Noguchi & Satoru Shimokawa, 2019. "Partial Smoking Ban and Secondhand Smoke Exposure in Japan," IJERPH, MDPI, vol. 16(15), pages 1-13, August.
    3. Giap Van Vu & Chau Quy Ngo & Phuong Thu Phan & Lan Phuong Thi Doan & Toan Thi Nguyen & Mai Hong Nguyen & Diep Ngoc Nguyen & Nguyen Thao Thi Nguyen & Huong Lan Thi Nguyen & Chi Linh Hoang & Linh Gia Vu, 2020. "Inadequate Knowledge, Attitude and Practices about Second-Hand Smoke among Non-Smoking Pregnant Women in Urban Vietnam: The Need for Health Literacy Reinforcement," IJERPH, MDPI, vol. 17(10), pages 1-15, May.

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