Research shows that cigarette smoke contains more than 7,000 chemicals, many of which are harmful toxins
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[3] Since your mouth is closed, the smoke cant go out of your mouth, so the only place it can move is through your nose
Professor Melanie Wakefield, of Cancer Council Victoria, and colleagues, report their findings in the journal Addiction
Siegmund from the USC Norris Comprehensive Cancer Center and the Department of Population and Public Health Sciences, Keck School of Medicine of USC, University of Southern California