传统上，烟草公司通过研究烟草和由“吸烟机”产生的烟雾的化学成份来评价香烟的潜在危害。
Traditionally, tobacco companies look at the chemical composition of tobacco and the smoke it produces when drawn through a "smoking machine" to assess its potential for harm.
传统上，烟草公司通过研究烟草和由“吸烟机”产生的烟雾的化学成份来评价香烟的潜在危害。
Traditionally, tobacco companies look at the chemical composition of tobacco and the smoke it produces when drawn through a "smoking machine" to assess its potential for harm.
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