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Below are some examples of how people calculate their pack year number, and why its important to assess individual risks

Nearly half were African American, and nearly half smoked at some point in their lives

Smoking cigarettes can damage the heart, blood vessels, and blood cells

We used an adaptive design, which means that part-way through data collection, an interim analysis was conducted to assess how many more participants would need to be recruited for the study to have enough statistical power to detect an effect of pack size

Reapply as Necessary : For heavily smoked-in areas, a second or third application might be necessary to fully break down stubborn odors

Body-mass index and obesity in urban and rural China: findings from consecutive nationally representative surveys during 200418