改变行为是非常困难的-即使知道他对生命的威胁，如吸烟。
Changing behavior - even when it's life threatening, such as smoking - is extremely difficult.
她认为患癌症风险的高低与其他生活习惯如吸烟，喝酒和肥胖无关。
She said the differences in cancer risks were independent of other lifestyle factors including smoking, alcohol intake and obesity.
对于一些行为如吸烟或饮酒来说，直接的网络效应相当明显，弗莱彻说。
For some behaviors, such as smoking or drinking, the direct network effect is quite apparent, Fletcher says.
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