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IMAGE: National Cancer Institute / Unsplash Looking at genetic profiles taken from the bronchi (the air passage that leads from the windpipe to the lungs) of 14 people who have never smoked and comparing them with samples taken from 19 light, moderate, and heavy smokers, the scientists found that the cells do mutate with natural age, and even more so in the lungs of smokers

research organization estimated nearly 20 percent of military personnel returning from Iraq and Afghanistan, or about 300,000 people, have symptoms of post-traumatic stress disorder or major depression

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