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As a consequence, research studies aimed at quantifying the problem and understanding its cause have increased dramatically over the past several years. The following review first examines epidemiological studies that have revealed a bidirectional causal relationship between tobacco dependence and posttraumatic stress disorder (PTSD), one of several mental health disorders in which tobacco dependence remains prevalent and resistant to intervention. Second, we use a translational neuroscience perspective to discuss possible neurobiological mediators of the relationship between PTSD and tobacco dependence, hoping to spur further human and animal research that will elucidate pathogenetic mechanisms involved and inspire novel treatment interventions. 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