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有些年轻人一旦吸烟很快就发展成终身成瘾者,而其他人却能较容易地戒烟,放弃已形成的习惯。为探讨其可能机理,美国国家心、肺及血液研究所的科学家观察了遗传因素对吸烟的影响,从1967年到1969年,1983年到1985年两次调查了4775对孪生兄弟,他们均在1917年到1927年之间出生,其中包括基因几乎完全相同的同卵双生者和基因有所不同的异卵双生者。这些人都曾在第二次世界大战期间
Some young people quickly develop into life-long addicts as soon as they smoke, while others are able to quit smoking more easily and abandon established habits. To explore its possible mechanism, scientists at the National Heart, Lung and Blood Institute looked at the effects of genetic factors on smoking. From 1967 to 1969, two pairs of 4775 twin brothers were surveyed from 1983 to 1985 Born between 1917 and 1927, including twins with almost identical genes and fraternal twins with different genes. These people were during World War II