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One JAMA study compared post-surgery risks for 125,000 people who smoke, 78,000 people who quit smoking at least a year before surgery and 400,000 people who have never smoked

For more information: The study, which was funded in part by the National Heart, Lung, and Blood Institute, can be read in full on the Journal of the American Heart Associations website.

The tobacco industry is a far greater threat than many realise as it is one of the worlds biggest polluters, from leaving mountains of waste to driving global warming, the World Health Organization has warned in a new report

This is known as lethal concentration 50%, or LC50