Sidney et al. found that among women, lung cancer risk was for lifelong smokers of filtered cigarettes than smokers of non-filtered cigarettes: "in long-term (> 20 years) smokers, the risk of lung cancer was decreased in women who had smoked filtered cigarettes for 20 or more years relative to lifelong smokers of unfiltered cigarettes (RR = 0.36, CI = 0.18-0.75)."

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