More often than not, cigarette smoking leads to a long list of health problems. From cancer to heart failure, the effects of long-term smoking can arise in nearly every function of your body. And yet every once in a while, I see a patient who, at 85, has smoked for decades and gotten off virtually scot-free.

For those rare healthy smokers, we typically pass off their unlikely healthfulness to mere luck — until now. A series of articles recently published in Nature Genetics sheds ...

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