Identified nicotine-dependent potential biomarkers

Metabolite names are listed in the first column (for classes and biochemical names, see Table S1). Mean values with standard error of metabolite concentrations in µM for each group, current smoker (S), former smoker (fS) and non-smoker (nS), are shown in columns 2 to 4, respectively. The first and second component score of the CA are given in columns 5 and 6. In the last three columns, p-values of ANOVA and Wilcoxon tests are indicated.