虽然吸烟行为，包括过早开始吸烟和过度吸烟是患病风险的主要原因，但也包括其他病理或生理的原因。

Although smoking behaviours, including early smoking initiation and heavy smoking, account for the greater part of this risk, other mechanisms or pathophysiologic pathways may be involved.

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虽然医生和科学家都明白，有无数危害健康的事情与合乎习俗的行为方式有关联，但在20世纪前50年，吸烟人数却戏剧性增加。

Though physicians and scientists understood there were numerous health hazards associated with the practice, the number of smokers increased dramatically in the first half of the 20th century.

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虽然反吸烟行为倡导者在过去的几十年里一直在努力，但是今天仍然有超过10亿的烟民。

Despite decades of work by health campaigners, more than one billion people still smoke today.

youdao

虽然反吸烟行为倡导者在过去的几十年里一直在努力，但是今天仍然有超过10亿的烟民。

Despite decades of work by health campaigners, more than one billion people still smoke today.

youdao