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http://mobile.abc.net.au/news/2013-10-11/smoking-risks-higher-death-disease-lung-cancer/5015588
REUTERS: ALEXANDRA BEIER, FILE PHOTO
The risk of premature death from smoking is much more severe than previously thought for both light and heavy smokers, a large Australian study has revealed.
The study found that two thirds of deaths in current smokers can be attributed to tobacco use.
Professor Emily Banks from the Australian National University led the study, which followed 200,000 people over a four years.
"The international rule of thumb is that half of all smoker deaths are directly caused by tobacco," she said.
"We found that people who are current smokers were three times more likely to die than people who had never smoked, and their life expectancy within that four-year period was diminished by 10 years compared to the never-smokers."