Sweeney C T, Kozlowski L T, Parsa P
Department of Biobehavioral Health, Penn State University, University Park 16802, USA.
Pharmacol Biochem Behav. 1999 May;63(1):167-73. doi: 10.1016/s0091-3057(98)00250-0.
Two studies were conducted to determine the effect of blocking filter vents on carbon monoxide (CO) exposure under ad lib smoking conditions. In Study 1, 12 daily cigarette smokers smoked cigarettes from the brands Now (1 mg tar by the FTC Method) and Marlboro Lights (10 mg tar) under each of two vent-blocking conditions (unblocked and finger blocked). Blocking filter vents with fingers led to an 85% increase in CO for the brand Now, but had no added effect on CO exposure from the Marlboro Lights. In Study 2, another 12 daily cigarette smokers smoked cigarettes from each of four additional brands: Carlton (1 mg tar), Now (2 mg tar), Virginia Slims Ultra-lights (5 mg tar), and Virginia Slims Lights (8 mg tar). Blocking filter vents with the lips caused all four brands to produce equal CO exposures. Blocking vents increased smokers' exposure to CO by 239% when smoking Carltons and by 44% when smoking Nows. No significant increases in CO with blocking were found for either of the Virginia Slims brands. These results suggest that the degree to which a brand is ventilated determines whether that brand is susceptible to increased CO yields as a result of vent blocking.
进行了两项研究，以确定在随意吸烟条件下，堵塞过滤嘴通风口对一氧化碳（CO）暴露的影响。在研究1中，12名每日吸烟者在两种通风口堵塞条件（未堵塞和手指堵塞）下，吸食了Now（按联邦贸易委员会方法测定焦油含量为1毫克）和万宝路淡味型（焦油含量为10毫克）品牌的香烟。用手指堵塞过滤嘴通风口会使Now品牌香烟的一氧化碳含量增加85%，但对万宝路淡味型香烟的一氧化碳暴露量没有额外影响。在研究2中，另外12名每日吸烟者吸食了另外四个品牌的香烟：卡尔顿（焦油含量为1毫克）、Now（焦油含量为2毫克）、弗吉尼亚细长型超淡味（焦油含量为5毫克）和弗吉尼亚细长型淡味（焦油含量为8毫克）。用嘴唇堵塞过滤嘴通风口会使所有四个品牌产生相同的一氧化碳暴露量。堵塞通风口使吸烟者在吸食卡尔顿香烟时的一氧化碳暴露量增加了239%，在吸食Now香烟时增加了44%。对于弗吉尼亚细长型的两个品牌，堵塞通风口均未导致一氧化碳含量显著增加。这些结果表明，一个品牌的通风程度决定了该品牌是否容易因通风口堵塞而导致一氧化碳产量增加。
