上面的蓝色晶体是能产生氧气使烟能持续燃烧的添加物。

The blue crystals are additives that keep the lit cigarette burning by producing oxygen.

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一路上她都在抽烟，我讨厌烟的味道，它使我经常咳嗽。

She smoked through the trip, and I hated the smell, which made me cough a lot.

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因此如何使那些吸烟者，或是细二手烟的人们降低患肺癌的危险呢？

So how can cigarette smokers, or people exposed to second hand smoke, lower the risk of lung cancer?

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