Considered to be a less dangerous alternative to tobacco, "e-cigarettes" are taking over the West as more and more people switch over when trying to kick the habit.
随着越来越多的人开始戒烟，被认为危险程度更小的替代物——电子烟在西方国家流行起来了。
That switch, which occurs just as the rats start to master the maze, likely signals that a habit has been formed, says MIT Institute Professor Ann Graybiel, senior author of the PNAS paper.
这个转变，就发生在当老鼠开始掌握了迷宫，可能也是行为形成的信号，麻省理工学院教授安·格雷比尔，同时也是美国国家科学院院刊高级作者，在文中说道。
Switch your cigarette habit for a nut habit -- four nuts in their shell for every cigarette you want to smoke.
吃坚果来代替你抽烟的习惯。 每当你想抽烟的时候就吃坚果。
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