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Smoking 15 cigarettes daily for 10 years equals 7.5 pack years: (15 20) 10 = 7.5 Smoking 20 cigarettes daily for 5 years equals 5 pack years: (20 20) 5 = 5 Smoking 40 cigarettes daily for 25 years equals 50 pack years: (40 20) 25 = 50 Smoking 10 cigarettes daily for 2 years equals 1 pack year: (10 20) 2 = 1 These examples demonstrate how the formula applies to varying smoking habits

Future research could expand the HEIC index to a national scale (depending on data availability) and then link HEIC scores to other, larger datasets, to better understand the potential associations between the HEIC and child health outcomes

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This cigarette format allows adult smokers to have a larger supply of the product

As health concerns and regulatory measures continue to evolve, being aware of typical cigarette pack sizes can help you make informed decisions