Pack Mentality: Why Is It So Hard to Quit Smoking?

With more than 5 million people dying each year from its effects, tobacco smoking is one of the leading causes of death around the world. Even with the Surgeon General's warnings, the number of smokers remains high, and according to the FDA, 50 percent of the people who recover from lung cancer surgery start smoking again afterwards. Here, we explore exactly what causes the difference between one puff and a habitual post-dessert drag.

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Sources: American Hearth Association, National Health Interview Survey, National Center for Health Statistics, World Health Organization, University of Ohio