New Dangers of Secondhand Smoke (Time.com) is an interesting story about a new study that measured the immediate effects of second-hand smoke on nonsmokers:
...the researchers found that waitstaff and bartenders working a typical night shift gradually accumulated higher levels of NNK, a carcinogen in cigarette smoke, at the rate of 6% each hour they worked. NNK is known to be involved in inducing lung cancer in both lab rats and smokers.
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