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. Author manuscript; available in PMC: 2016 Sep 15.
Published in final edited form as: Environ Int. 2015 Dec 12;88:1–8. doi: 10.1016/j.envint.2015.12.003

Fig. 2.

Fig. 2

Tobacco specific biomarker measurements among recent marijuana users and nonusers. (a) Least square geometric means of urinary total NNAL (pg/mL) calculated with and without log10-transformed serum cotinine as one covariate in the multiple regression analysis. (b) Geometric means of serum cotinine among marijuana users and nonusers. Error bars indicate 95% confidence intervals. Urinary NNAL data was available in NHANES 2007–2012.