二手烟包括“侧流烟”(烟草产品燃烧释放的烟)和“主流烟”(吸烟者呼出的烟)。

Secondhand smoke is the combination of "sidestream" smoke (the smoke given off by a burning tobacco product) and "mainstream" smoke (the smoke exhaled by a smoker).

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二手烟不仅来自吸烟者呼出的烟气（我们称之为主流烟气），而且来自从烟尾、雪茄或者烟管中飘散出的烟气（我们称之为测流烟）。

Secondhand smoke comes from both the smoke that smokers exhale (called mainstream smoke) and the smoke floating from the end of the cigarette, cigar, or pipe (called sidestream smoke).

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对吸烟和二手烟的健康危害，公众有着大量误解。主流社会认为吸烟是可接受的习惯，因此吸烟仍很广泛。

Numerous public misconceptions remain about the health hazards of smoking and secondhand smoke. Mainstream society considers smoking an accepted behavior and smoking remains popular.

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