在麻省技术研究所的磁屏蔽室中,让二名重度吸烟者(日一盒半以上)和9名不吸烟者同时吸入痕量的Fe_O_4粉尘,然后用一种灵敏的磁检出器检测这种磁性粉尘从肺部廓清的不同情况。结果发现,吸烟者对粉尘的廓清能力大大低于不吸烟者,约一年后仍有将近50％的粉尘留在吸烟者的肺中,不吸烟者肺中粉尘的残留量却只有原来的10％。实 In the magnetically shielded room at the Massachusetts Institute of Technology, two heavy smokers (over a half-daily box) and nine non-smokers inhaled traces of Fe_O_4 dust, which was then detected using a sensitive magnetic detector Different kinds of magnetic dust cleared from the lungs. The results showed that smokers significantly lower the capacity of dust clearance than non-smokers, about a year later, there is still about 50% of the dust left in the smoker’s lungs, non-smokers, the lungs of the residual dust but only the original 10 %. real