Free radicals also come from outside sources, such as smoking, environmental pollution, and synthetic chemicals that are added to our water and food. Some tips for living longer and anti-aging.

同时外界的因素也会产生自由基如抽烟环境污染还有那些添加在饮用水和食物里的人工合成化学物质。一些使你延缓衰老和更长寿的方法。

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Many people in the New England Centenarian Study experienced a century free of cancer or heart disease despite smoking as many as 60 cigarettes a day for 50 years.

在新英格兰百岁老人研究中许多人即使50年中每天都抽60支之多的香烟，仍在一个世纪中未罹患上癌症或心脏病。

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He says while research suggested these ill effects could be reversed within two years if the child lived in a smoke-free house, for many the ramifications of parental smoking were life-long.

他认为，尽管有研究表明，这些儿童在远离二手烟雾两年内其所受的损害会有所逆转，但是对于他们中的很多人来说，这种来自父母吸烟的危害将伴随终生。

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A new study has found the strongest evidence yet that smoke-free laws can reduce a major effect of tobacco smoking - heart disease.

VOA: special.2009.01.07

Gapstur credits the reduction in cigarette smoking, sparked by education campaigns, smoke-free laws,taxes and social policies for that.

VOA: standard.2010.03.25

The proposals mean all restaurants in England would be smoke-free, along with pubs and bars serving food, she added, and "non-food" pubs and bars will be free to choose whether to allow smoking, or be smoke-free.

BBC: NEWS | UK | UK Politics | Cabinet agrees England smoke ban

But cigarette packets will no longer be mini, mobile advertising boards and, for those working to reduce smoking levels, plain packaging is an important stage in the shift to a smoking-free society.

BBC: Australia smokers given plain packs

Their policy on public place smoking is that they support the creation of smoke-free areas but that a ban on all indoor smoking in work and public places goes too far.

BBC: Africa heading for 'smoking epidemic'