Smoking Away from the conference, a study discussed in an editorial in last week's Journal of the National Cancer Institute threatens to undo years of health education. A study of American and Canadian women with a particular gene that increases the chance of breast cancer found that smoking one pack of cigarettes a day for four or more years appears to reduce the risk of developing breast cancer. This doesn't mean you should smoke, says Paul Kleihues of the International Agency for Research on Cancer, in Lyon, France. That's playing Russian roulette with lung cancer and numerous other diseases. Kleihues and his colleagues believe smoking reduces estrogen production, thus slowing cancer growth.
Experts are quick to say more studies are required.
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