Being exposed to second hand smoke, also known as passive smoking - non-smokers breathing in smoke from lit cigarettes around them - may significantly increase the long-term risk of developing lung disease, such as lung cancer and COPD (chronic obstructive pulmonary disease), according to a report published in the American Journal of Respiratory and Critical Care Medicine. The same applies to casual (occasional) smoking. This is the first study to demonstrate what passive or occasional smoking does to the body at a gene function level, say the
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