Last year the World Health Organization (WHO) warned against using electronic cigarettes, saying there was no evidence to prove they were safe or helped smokers break the habit.

世界卫生组织(WHO)曾在去年提醒人们不要吸电子香烟，称没有证据证明其安全性，以及帮助戒烟的功用。

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Manufacturers claim that electronic cigarettes are a safe alternative to conventional cigarettes.

制造商声称电子香烟是一种安全的香烟替代品。

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Electronic cigarettes - a safe way to light up?

电子香烟——安全的吸烟方式？

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Counterfeit cigarettes, for example, can result in a very large loss in taxes as well as perhaps less safe cigarettes.

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After all, how can you prove that cigarettes are safe and effective?

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"There are safe beaches, parks and gardens, and of course cheap alcohol and cigarettes, " she said.

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