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This is why in today's article we will be focusing on tar and nicotine among all other harmful chemicals

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

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Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines 31 for each of our systematic reviews, we identified studies reporting relative risk (RR) of incidence or mortality from each of the 36 selected outcomes for smokers compared with nonsmokers

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