Press Release: Smoking genes? European scientists discover the first case of a genetic dependence to nicotine

Scientists from an EU-supported consortium have discovered that a mutation in a human gene confers nicotine dependence. They have shown that a particular variant of a nicotine-receptor gene impacts smoking behaviour and hence confers a 30% increase in risk of lung cancer and a 20% increase in risk of peripheral artery disease (PAD), a common and debilitating constriction of the arteries to the legs. Roughly half of the people of European descent carry at least one copy of this genetic variant, which does not influence smoking initiation, but makes it more difficult to quit. The results stem out from the European project GENADDICT (Genomics, mechanisms and treatment of addiction), which is supported by 8.1 million euros' worth of funding from the EU’s Sixth Framework Programme for research and by the U.S. National Institutes of Health.