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Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung While vaping is not risk free, it is less harmful than tobacco Our World in Data Figure 3.1, Percentage of recalled age at which adult smokers first tried a cigarette and began smoking daily, among 30 to 39 year old adult smokers, by smoking status; National Survey on Drug Use Tobacco consumption among men and women 1927 2007 Tidsskrift for Den norske legeforening More than one third of U.S. teens have used at least one substance by age 16, according to a new study led by researchers at the University of California San Diego that found Smoking cessation Wikipedia

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