Over the last 30 years, the number of smokers in the U.S. has continuously decreased-a tribute to the efforts of public-health workers everywhere. And while this fact is unarguable, less obvious are the social and informative forces that lead an singular to kick the habit. In fact, when someone crumbles that last empty pack of their preferred unfiltered brand and vows to never buy another, he might not realize that he is less like the heroic discrete grasping his own boot straps and more like a single bird whose sudden left turn is just one speck in the larger flock.

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