“Converging evidence suggests that the endocannabinoid system is an important constituent of neuronal substrates involved in brain reward processes and emotional responses to stress.. It is known that the endocannabinoid system plays a modulatory role in emotional states such as anxiety and fear. Several studies utilizing rodent models of anxiety or depression showed that FAAH inhibition produced anxiolytic-like effects and anti-depressant-like effects…

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2213536/