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.

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。

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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.

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。

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