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.

youdao

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.

youdao

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.

youdao