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The effect of occasional smoking on smoking-related cancers

In the European Prospective Investigation into Cancer and Nutrition (EPIC)

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Abstract

Objective

Most studies on tobacco smoking have focused on daily-smokers. Occasional smokers, who have never smoked daily, have often been included in the reference group of never-smokers. We have investigated the association between occasional smoking and cancer of the bladder, kidney, pancreas, upper aero-digestive tract and lung.

Methods

The study population consisted of 158,488 persons, who provided information on occasional smoking, within the European Prospective Investigation into Cancer and Nutrition (EPIC), 780 of whom developed a smoking-related cancer. We used Cox proportional hazard model, stratified by gender and country to estimate incidence rate ratios (IRR) for smoking-related cancers.

Results

The results suggest that occasional smokers have a higher risk of bladder cancer (IRR: 1.92, 95% confidence interval (CI) 0.93–3.98) and of the major smoking-related cancers combined (IRR: 1.24, 95% CI 0.80–1.94) than true never-smokers. Including occasional smokers in the reference group resulted in a lower risk estimate for former and current smokers.

Conclusions

Occasional smoking should be discouraged.

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Abbreviations

IRR:

Incidence rate ratio

CI:

Confidence intervals

EPIC:

European Prospective Investigation into Cancer and Nutrition

IARC:

International Agency for Research on Cancer

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Acknowledgements

We thank all the participants in EPIC.

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Correspondence to Ole Raaschou-Nielsen.

Additional information

The work described in the paper was carried out with the financial support of the “Europe Against Cancer” Programme of the European Commission (SANCO); Deutsche Krebshilfe; German Cancer Research Center; German Federal Ministry of Education and Research; Danish Cancer Society; Italian Association for Research on Cancer; Italian National Research Council; Dutch Ministry of Public Health, Welfare and Sports; National Cancer Registry and the Regional Cancer Registries Amsterdam, East and Maastricht of the Netherlands; Norwegian Cancer Society; Research Council of Norway; World Cancer Research Fund (WCRF); Swedish Cancer Society; Swedish Scientific Council; Regional Government of Skåne, Sweden.

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Bjerregaard, B.K., Raaschou-Nielsen, O., Sørensen, M. et al. The effect of occasional smoking on smoking-related cancers. Cancer Causes Control 17, 1305–1309 (2006). https://doi.org/10.1007/s10552-006-0068-9

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  • DOI: https://doi.org/10.1007/s10552-006-0068-9

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