how many cigarettes is considered a heavy smoker Light vs. Smoker: Are Dangers the Same? Mortality in relation to smoking:

Mortality in relation to smoking: 50 years' observations on male British doctors PMC 2 19 16: LUNG CANCER: Annual CT Screening Should Be Considered for Former Heavy Smokers Up to 30 Years After They Quit the Habit Ann G. Sjoerdsma The number of cigarettes use per day among smokers Figure 2 shows the Download Scientific Diagram Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung

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