That's because habit is second nature.

习惯成自然呗。

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The smaller the better, because habit change is difficult, and trying to take on too much is a recipe for disaster.

越小越好，因为要改变习惯很困难，企图一口吃个胖子是制造灾难的良药。

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We say, "I love you" to our parents or significant other when we hang up the phone, not because we mean it, but out of habit.

我们会在挂电话时和父母或者某个重要的人说“我爱你”，不是因为我们真的想这么说，而是因为习惯。

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It's a bad habit to get into, because when you come back to it, it may haunt you later on down the road. So really get into that notion of trying to be defensive as you program.

来运行程序的时候,错误就会出现缠住你了,因此现在我们真的要培养,在程序中有防卫性设计的概念。

麻省理工公开课 - 计算机科学及编程导论课程节选

Partly because of habit.

ECONOMIST: Britain

Today, smoking remains a stubborn habit because it is an integral part of Chinese social life.

CNN: China clouded in cigarette smoke

It's starting to become a habit because I have nothing else to do.

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