Rimington J
Br Med J. 1972 Apr 29;2(5808):262-4. doi: 10.1136/bmj.2.5808.262.
Male mass radiography volunteers aged 40 or more were questioned about their sputum production and cigarette consumption in relation to type (filter or plain) smoked. Of 10,414 volunteers, 3,045 smoked filter cigarettes and 2,393 smoked plain cigarettes. The rate of persistent daily sputum of filter smokers (31.9%) was significantly lower than that of plain cigarette smokers (37.2%). A similar pattern was maintained when age and cigarette consumption were standardized. These figures are thought to understate the less injurious nature of filter cigarettes, since more than half of the filter smokers with persistent sputum developed this while previously smoking plain cigarettes.Whatever the reasons for the less injurious nature of filter cigarettes, it seems that cigarette smokers unable to stop smoking might suffer less from chronic bronchitis if they changed to filter cigarettes.
年龄在40岁及以上的男性胸部X光摄影志愿者被询问了他们的痰液分泌情况以及与所吸香烟类型（过滤嘴或普通）相关的吸烟量。在10414名志愿者中，3045人吸过滤嘴香烟，2393人吸普通香烟。吸过滤嘴香烟者持续每日咳痰的比例（31.9%）显著低于吸普通香烟者（37.2%）。在对年龄和吸烟量进行标准化后，这一模式依然存在。这些数据被认为低估了过滤嘴香烟危害较小的特性，因为超过一半有持续咳痰症状的过滤嘴吸烟者是在之前吸普通香烟时出现这种情况的。无论过滤嘴香烟危害较小的原因是什么，似乎无法戒烟的吸烟者如果改用过滤嘴香烟，患慢性支气管炎的痛苦可能会减轻。
