Tobacco, Smoking and Breast Cancer Risk

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“A critical weekly review of important new research findings for health-conscious readers”


Tobacco smoke is unquestionably the single greatest cause of preventable cancer cases.  However, the link between smoking (including passive exposure to secondhand tobacco smoke) and breast cancer has been rather unclear, so far.  Now, a newly published study, which appears in the current issue of the British Medical Journal, has strongly linked exposure to tobacco smoke with breast cancer risk.

More than 79,000 women (ages 50 to 79 years) enrolled in the enormous landmark, prospective Women’s Health Initiative (WHI) study between 1993 and 1998.  (This is the very same study that confirmed the long suspected link between hormone replacement therapy and breast cancer risk.)  All participants in this huge clinical study provided detailed information regarding their history of both active and passive exposure to tobacco smoke.  Known risk factors for breast cancer were also assessed, and accounted for, when analyzing this study’s data.  During more than 10 years of follow-up, 3,520 cases of breast cancer were diagnosed within this very large group of women.

Compared with women who had never smoked, former smokers were 9 percent more likely to be diagnosed with breast cancer, while current active smokers were 16 percent more likely than never-smokers to develop breast cancer.  Women who had smoked for 50 years or more were at especially high risk of developing breast cancer (they were 35 percent more likely to be diagnosed with breast cancer when compared to never-smokers).

Among women who had never smoked, women with 10 or more years of childhood exposure to secondhand tobacco smoke, or 20 or more years exposure as an adult, had a 32 percent greater risk of developing breast cancer than never-smokers who had not been exposed to secondhand tobacco smoke.

Taken together, these new findings from the powerful WHI study significantly link both active exposure to tobacco smoke and exposure to secondhand tobacco smoke with large increases in the risk of developing breast cancer.  As if there were not already enough reasons to avoid tobacco, this very powerful prospective clinical research study’s findings confirm yet another life-threatening risk associated with tobacco (including exposure to secondhand smoke).

For a complete discussion of evidence-based approaches to cancer risk and cancer prevention, order your copy of my new book, A Cancer Prevention Guide for the Human Race.  For the price of a cheeseburger, fries, and a shake, you can purchase this landmark new book, in both paperback and e-book formats, and begin living an evidence-based cancer prevention lifestyle today!

On Thanksgiving Day, 2010, A Cancer Prevention Guide for the Human Race was ranked #6 among all cancer-related books on the “Top 100 Bestseller’s List” for Kindle e-books! On Christmas Day, 2010, A Cancer Prevention Guide for the Human Race was the #1 book on the Amazon.comTop 100 New Book Releases in Cancer” list!

Disclaimer:  As always, my advice to readers is to seek the advice of your physician before making any significant changes in medications, diet, or level of physical activity

Dr. Wascher is an oncologic surgeon, professor of surgery, cancer researcher, oncology consultant, and a widely published author

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I and the staff of Weekly Health Update would again like to take this opportunity to thank the more than 100,000 health-conscious people, from around the world, who visit this premier global health information website every month. (More than 1.2 million health-conscious people visited Weekly Health Update in 2010!) As always, we enjoy receiving your stimulating feedback and questions, and I will continue to try and personally answer as many of your inquiries as I possibly can.

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