吸烟有害健康,但究竟多有害呢?
Smoking leaves an "archaeological record" of the hundreds of DNA mutations it causes, scientists have discovered.
科学家研究发现,吸烟会导致DNA突变,给人留下数百种基因突变的“永久记录”。
Having sequenced thousands of tumour genomes, they found a 20-a-day smoker would rack up an average of 150 mutations in every lung cell each year.
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。
The changes are permanent, and persist even if someone gives up smoking.
这些突变是永久且持续的,即使吸烟者戒烟也不可逆。
Researchers say analysing tumour DNA may help explain the underlying causes of other cancers.
研究人员说,分析肿瘤DNA能帮助解释其他癌症的深层原因。
Pamela Pugh, 69, was diagnosed with lung cancer in 2013. She started smoking aged 17 and quit in her early 50s.
69岁的帕梅拉-皮尤2013年被诊断患有肺癌。她自17岁开始吸烟,近50岁时戒烟。
But she said: "Even though I gave up many years ago, the effects of smoking caught up with me.
但她说:“尽管我很多年前就戒烟了,但吸烟的影响一直在。”
"Had I known as a teenager that smoking caused mutations which would stay with me for life then I would never had started".
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