Thought of the day: What role does trauma play in addiction?

Based on personal observation, it seems as though addiction and trauma of some sort go hand in hand. Whether the trauma is before the use and abuse begins, or if it is a consequence of active using, there will be traumas great or small that each addict must deal with. As for it's impact on recovery, I would say it is a fundamental issue in recovery. The correlation between PTSD and substance abuse/addiction has been shown time and again. Who can we best address trauma in treatment?