AHRR and post-traumatic stress disorder: To evaluate the possibility of confounding due to unreported smoking among those that identify as non-smokers, we tested top smoking-related CpGs, including AHRR, for association with PTSD, and identified no evidence of association between smoking-related CpG sites and PTSD, supporting our conclusion that the association between AHRR CpG sites and PTSD was independent of smoking.