Woodman G, Newman S P, Pavia D, Clarke S W
Eur J Respir Dis. 1987 Mar;70(3):187-92.
Ten asymptomatic smokers each smoked a low, low-to-middle and a middle tar cigarette with approximately the same tar-to-nicotine ratio, in a randomised order. The inhaled smoke volume was measured by tracing the smoke with the inert gas 81Krm. Puffing indices were recorded using an electronic smoking analyser and flowhead/cigarette holder. Throughout the study neither the mean inhaled smoke volume per puff nor the total inhaled smoke volume per cigarette changed significantly; however, the mean and total puff volumes were largest with the low tar cigarette and decreased with the higher tar brands. Puff volume was related to puff work (rs = 0.83, P less than 0.001) but was not related to puff resistance (rs = 0.10, P greater than 0.1). It is concluded that when switched between brands with the same tar-to-nicotine ratio, smokers increase their puff volumes with a lower tar cigarette but do not change the volume of smoke inhaled. Puff work and puff resistance were significantly correlated (rs = 0.45, P less than 0.02).
十名无症状吸烟者，每人以随机顺序分别吸一支低焦油、低-中焦油和中焦油香烟，这些香烟的焦油与尼古丁比例大致相同。使用惰性气体81Krm追踪烟雾来测量吸入的烟雾量。使用电子吸烟分析仪和流量头/烟嘴记录抽吸指数。在整个研究过程中，每次抽吸的平均吸入烟雾量和每支香烟的总吸入烟雾量均无显著变化；然而，低焦油香烟的平均和总抽吸量最大，且随着焦油含量更高的品牌而减少。抽吸量与抽吸功相关（rs = 0.83，P小于0.001），但与抽吸阻力无关（rs = 0.10，P大于0.1）。得出的结论是，当在焦油与尼古丁比例相同的品牌之间转换时，吸烟者吸低焦油香烟时会增加抽吸量，但不会改变吸入的烟雾量。抽吸功和抽吸阻力显著相关（rs = 0.45，P小于0.02）。
