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Acknowledgment Not applicable Funding There was no funding for design of the study sand collection, analysis and interpretation of data and for writing the manuscript

Researchers at Northwestern Medicine in Chicago developed such a device that resembles a lapis blue pendant and detects users smoking habits much more reliably than previous systems

Variations in Cigarette Pack Sizes While the standard pack size is 20 cigarettes, variations do exist

A 5 ml mixture containing 1666.7ul of each LDH assay substrate solution, LDH assay cofactor, and LDH assay dye solution was prepared, of which 50 L (standard kit volume) was pipetted into each well containing samples (Figure 2)