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Scatterplots of urinary cotinine with (A) NNAL, (B) 1-HOP, and (C) NNN. The solid line in each of the panels represents the least-square fit. 1-HOP = 1-hydroxypyrene; Cr = creatinine; NNAL = 4-(methylnitrosamino) −1-(3-pyridyl)−1-butanol; NNK = 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone; NNN = N′-nitrosonornicotine.
