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Scatter plots of serum levels (pg/mL) of cytokines CXCL9/MIG and sIL-6R for non-smokers (n = 30), current smokers (n = 30), and ex-smokers (n = 18). Whiskers were calculated using the Tukey method. Outliers not shown. * p < 0.05, ** p < 0.01: Kruskal–Wallis test and Dunn’s multiple comparison test.
