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The pack year formula is straightforward: divide the number of cigarettes smoked daily by 20 (cigarettes per pack), then multiply by the total years smoked

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Tobacco plant leaf and Merit cigarette butt extracts were investigated using double beam UV-visible spectroscopy in the range of 190900 nm (Edinburgh Instruments DS5, United Kingdom) using a quartz cuvette

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Principal component analysis (PCA) was applied to display the classification of data and obtain the intuitive distribution of samples among various groups