According to this article, it is easier to quit smoking while on vacation or otherwise in a new location so that you have fewer of the cues that trigger the habit of smoking. You're not in your usual routine, so you aren't just grabbing a cigarette at the usual times without thinking about it.
The article is actually about a lot more than that, and even though it is from the New York Times and may require a login, I recommend reading it. It's fascinating. It's about habits, hand-washing, advertising, and manipulating people.
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