研究：吸烟可永久改变基因
<p>吸烟有害身体健康已经人尽皆知，近些年已经有越来越多的人加入戒烟行列。大多数人都觉得，戒烟了总没事儿了吧？最新研究结果显示，真相并非如此：研究显示，吸烟导致的基因突变会伴随你一生。</p><p><span word="Smoking">Smoking</span> <span word="leaves">leaves</span> <span word="an">an</span> "<span word="archaeological">archaeological</span> <span word="record">record</span>" <span word="of">of</span> <span word="the">the</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="DNA">DNA</span> <span word="mutations">mutations</span> <span word="it">it</span> <span word="causes">causes</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="discovered">discovered</span>.</p><p>科学家研究发现，吸烟会导致<span word="DNA">DNA</span>突变，给人留下数百种基因突变的“永久记录”。</p><p><span word="Having">Having</span> <span word="sequenced">sequenced</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="tumour">tumour</span> <span word="genomes">genomes</span>, <span word="they">they</span> <span word="found">found</span> <span word="a">a</span> 20-<span word="a">a</span>-<span word="day">day</span> <span word="smoker">smoker</span> <span word="would">would</span> <span word="rack">rack</span> <span word="up">up</span> <span word="an">an</span> <span word="average">average</span> <span word="of">of</span> 150 <span word="mutations">mutations</span> <span word="in">in</span> <span word="every">every</span> <span word="lung">lung</span> <span word="cell">cell</span> <span word="each">each</span> <span word="year">year</span>.</p><p>在对数千个肿瘤基因组进行测序后，科学家发现每天吸烟20支的人每年每个肺细胞累积平均有150个基因突变。</p>
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