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95% CI, 1-3) and exclusive tobacco users (RR = 1.72

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The biggest risk factor for lung cancer is smoking

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Mervyn Witherspoon, a British chemist who once worked for the biggest independent maker of acetate filters, said the industrys focus on finding a biodegradable filter came and went, because there was never a pressure to do it. We would work on it and find some solutions but the industry would find something more interesting to work on and it would go on the backburner again, Witherspoon said