FAAH and post-traumatic stress disorder: FAAH polymorphisms that reduce enzymatic activity and elevate AEA levels have been associated with a lower risk for adolescent-onset anxiety in humans and mice (Desai et al. 2024; Gee et al. 2016; Gerhard et al. 2023) and have been associated with a higher risk of PTSD in adolescents (Marusak et al. 2024).