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even after low tar cigarette use became widespread, and the National Cancer Institute concluded in 2001 that there was no evidence such cigarettes brought any public health benefits

With this study, we have found that people who smoke a pack a day develop an average of 150 extra mutations in their lungs every year, which explains why smokers have such a higher risk of developing lung cancer. Additional reporting by agencies Join our commenting forum Join thought-provoking conversations, follow other Independent readers and see their replies Comments

We now wish to develop new assays that can measure someones capacity for DNA repair or detoxification, which could offer a new way to assess ones risk for lung cancer, said Dr

There are over 75 species within the Nicotiana genus, and within each species are many varieties

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