However, in smokers who had not smoked for more than 20 years, the decrease in FEV1 was equal to that of a never smoker.30 In addition, there are many studies that mention the beneficial health effects of smoking cessation in lung diseases15,31 or in lung function.32,33 Thus, in the Lung Health Study, it was observed that people who had not smoked for one year had an average increase in FEV1 of 47ml.32 This study has some limitations
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History: Cellulose acetate filters were first introduced in the 1950s
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