肺癌

戒烟后身体的变化非常大：

    戒烟20分钟后：尼古丁会限制血液的流动，因此随着戒烟后身体里尼古丁含量的降低，全身的循环系统得到改善，特别是手和脚部。
    戒烟8小时后：血液中的含氧量达到不吸烟时的水平，同时体内一氧化碳的含量减少到一半。
    戒烟24小时后：体内残留的一氧化碳消失殆尽，肺部开始清除粘液和其他令人讨厌的吸烟残留物。
    戒烟48小时后：尼古丁全部消除，你会感觉你的味觉和嗅觉开始得到改善。
    戒烟72小时后：呼吸变得更加轻松，同时你会发现整体精神状态有所改善。
    戒烟3-9个月后：任何呼吸问题都得到了改善，而且肺部的效率增加了10%。
    戒烟1年后：生殖能力增加了1/3。
    戒烟5年后：患心脏病的风险下降到了吸烟前的一半，而患中风的危险与不吸烟者相当。
    戒烟10年后：患肺癌的几率达到了正常人的一半。
    戒烟15年后：患心脏病的危险与从不吸烟的人相同。
    PS：如果你在35岁前戒烟成功，那么你的预期寿命将和正常人一样。

==== 汉译英 ====

Changes in body after quitting smoking is very large:
    20 minutes after quitting: nicotine will limit the blood flow, so as the body after smoking cessation nicotine reduction, improved circulation systems of the body, especially the hands and feet.
    8 hours after quitting: blood levels of oxygen to reach the level when the non-smokers, while the body reduced to half of the carbon monoxide levels.
    24 hours after quitting: carbon monoxide, residual body disappeared, the lungs began to clear the mucus, and other nasty smoke residues.
    48 hours after quitting: the total elimination of nicotine, you will feel your sense of taste and smell begin to improve.
    Quit smoking after 72 hours: breathing becomes easier, and you will find that the overall mental state improved.
    3-9 months after quitting: any breathing problems have been improved and the efficiency of the lungs increased by 10%.
   1 year after quitting: Reproductive capacity increase of 1 / 3.
    Quit smoking five years later: risk of heart disease dropped to half of the pre-smoking, while the risk of stroke and non-smokers quite.
    10 years after quitting: The risk of lung cancer has reached half of normal.
    Quit smoking 15 years later: risk of heart disease with the same people who never smoked.
    PS: If you are quitting smoking before the age of 35, then your life expectancy will like normal.