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The relationship between 24 hr urine Total Nicotine Equivalents and A) Cigarettes per day (r = .44, p = .001; Line of best fit: y=16.3 +0.07x), B) Total puff volume (r = .38, p = .004; Line of best fit: y= 40.0 + 1.03x), and C) Daily puff volume (r = .49, p < .001, Line of best fit: y= 27.6 + .004x). Daily puff volume is the product of cigarettes per day and total puff volume.
