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Researchers examined data from previous studies to develop a genetic risk score for heavy smokers.
FORBES: Genetic Factors Linked to Smoking Addiction in Teens
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Those who did try cigarettes and had a high-risk gene score were more likely to become heavy smokers.
FORBES: Genetic Factors Linked to Smoking Addiction in Teens
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Schizophrenics, it has recently been found, are likely to be heavy smokers because nicotine is good for their condition.
ECONOMIST: Drugs to make you cleverer are in the test-tube. Good
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However, the researchers found that teenagers who had already developed anxiety problems were no more likely to become heavy smokers.
BBC: Teenage smokers
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And even men who quit less than a decade before diagnosis had similar survival rates to nonsmokers, provided they were not heavy smokers to begin with.
CNN: Smoking linked to more aggressive prostate cancer
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Though Japan Tobacco has more than two-thirds of the Japanese cigarette market--Japanese are still heavy smokers, and its Mild Seven brand is the Japanese salaryman's emblematic gasper--sales are slowing.
FORBES: Japan Tobacco Deal Is All About Russia
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While a 2006 French study found that people with diets high in beta-carotene had a slower decline in lung function over an eight-year period, heavy smokers and drinkers may not benefit.
CNN: Vitamin E may protect lungs
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In lay terms, coal plants have been heavy smokers.
FORBES: Coal Plants Belching Out Less Mercury
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The long held belief that adults who are unable to quit smoking is ultimately related to duration of smoking may potentially be replaced by such research showing that there are specific genetic factors which could influence teen smokers to become heavy smokers throughout their lives.
FORBES: Genetic Factors Linked to Smoking Addiction in Teens
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The government granted an extension to these smokers' havens after heavy lobbying by the country's 30, 000 tobacco bars, the only point of sale for cigarettes in France.
NPR: French Begin to Put Smoking Ban in Place
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But America's insistence on prohibition, and the heavy penalties it imposes even on possessors and smokers of cannabis, mean that the problem is unlikely to dwindle soon.
ECONOMIST: America's border troubles, north and south | The