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====Radioactivity==== [[Polonium-210]] is a radioactive trace contaminant of tobacco, providing additional explanation for the link between smoking and [[bronchial cancer]].<ref name="polonium">{{cite journal|jstor=1712451|title=Polonium-210: A Volatile Radioelement in Cigarettes|journal=Science|volume=143|issue=3603|pages=247β249|last1=Radford|first1=Edward P.|last2=Hunt|first2=Vilma R.|year=1964|doi=10.1126/science.143.3603.247|pmid=14078362|bibcode=1964Sci...143..247R|s2cid=23455633}}</ref> The radioactive particles build up over time in the lungs and a UCLA study has estimated that the radiation from 25 years of smoking would cause over 120 deaths per thousand smokers.<ref>{{Cite web|url=https://www.uclahealth.org/news/big-tobacco-knew-radioactive-particles-in-cigarettes|title=Big Tobacco knew radioactive particles in cigarettes posed cancer risk but kept quiet|website=www.uclahealth.org}}</ref>
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