PAHs are chemicals released into the air from the burning of coal, diesel, oil and gas, or other organic substances such as tobacco.

多环芳烃是由煤炭、柴油、石油和汽油的燃烧释放出来的，或者如烟草这样的有机物。

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Cancers, they add, are "limited to societies that are affected by modern lifestyle issues, such as tobacco use and pollution resulting from industrialisation".

他们还补充说：“癌症仅限于那些受到现代社会生活方式问题，诸如吸烟和工业化导致的污染，影响的社会。”

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The burden of oral diseases and other chronic diseases can be decreased simultaneously by addressing common risk factors such as tobacco use and unhealthy diet

通过处理烟草使用和不健康饮食等共同危险因素，可同时减轻口腔疾病和其它慢性病负担

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The more contact the boys had with tobacco smoke the more likely they were to have recognizable behavior problems, such as extreme excitability and aggression.

VOA: special.2009.01.13

During the ceremony, offerings such as tobacco may be made to the spirits.

BBC: The origins of bathhouse culture around the world

He said it was possible that people had modified their lifestyles to reduce exposure to risk factors such as tobacco smoke.

BBC: Childhood asthma starting to fall

They can enhance a sense of community, and avoid the defiance that can sabotage well-meaning laws, such as tobacco taxes that spawn smuggling.

CNN: Ethicist: Health bans and 'sin taxes' can easily backfire