Cigarettes: A Smoking Gun in Cancer Chemoprevention

Abstract
A growing body of literature indicates that chemopreventive agents may have very different effects in populations that differ by lifestyle or host factors. One such factor of paramount importance is smoking status, which has been shown to predict the effects of micronutrients such as β-carotene or related compounds in smoking-related cancer prevention trials. Some nutrients that appear to reduce the risk of cancer in nonsmokers may actually increase the risk of cancer in smokers, whereas other preventive nutrients may work better in smokers than nonsmokers.

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