cigarettes contain carcinogens in Cigarette Smoke Smokeless tobacco and cigarette smoking:

October 15, 1986 Donated by Mary Ann Cromer, MD, Somerville, Massachusetts Lost to history Philip Morriss quest to capture the hearts and lungs of American women who smoked left competitors gasping for breath

10.1373/clinchem.2005.061408 [DOI] [PubMed] [Google Scholar] Danieli M

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In addition, to highlight the models ability in retrieving daily variations in PM 2.5 when controlling the seasonal and spatial variations, we included month-intercept (fix-month R 2 ) as well as month and station intercepts (fix-month-and-station R 2 ) when computing R 2 (within R 2 ) of the 20-fold cross-validation predictions following a previous study 10 (Supplementary Table 5)