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Boxplots of DNA methylation at cg05575921 vs. serum cotinine and/or THC positivity in the 12th grade. “Cotinine +” indicates > 3 ng/mL and “THC +” indicates > 0.5 ng/mL. Significance codes: *p ≤ 0.05; **p ≤ 0.01; ***p ≤ 0.001 (Tukey's Honest Significant Difference).
