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In recent years, researchers have also uncovered additional links between smoking and cardiovascular conditions, such as atrial fibrillation and other cardiac arrhythmias

A pack-year is calculated by multiplying the number of packs of cigarettes smoked per day by the number of years smoked

more likely to be men, African American or multiracial, never married, unstably housed, and an urban resident

The BMJ Publishing Group (Journal of Neurology, Neurosurgery & Psychiatry) (2012) puts it this way: hiccups happen when spasmodic contractions hit the diaphragm and intercostal muscles through a reflex arc running via the phrenic and vagus nerves to a central hiccup generator