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Smoking remains the leading preventable cause of disease and death in the nation, said co-author Dr

The mu-opioid receptor gene and smoking initiation and nicotine dependence

cigarette price increases, expansion of smoke-free areas, provision of smoking cessation services, and introduction of graphic health warnings) as well as the effect of education and media campaigns to inform the public of smoking-associated health risks 6

That means regularly smoking 20 cigarettes a day can shave 10 years off your life expectancy

The researchers, from Kyungpook National University in South Korea and Vanderbilt University Medical Center in Tennessee, theorized that chewing hard substances raises the level of glutathione, which in turn helps memory and cognitive function