How Are Post-Traumatic Stress Disorder (PTSD) and Addiction Similar?

With June being Post-traumatic stress disorder (PTSD) awareness month, I wanted to take a closer look at PTSD and what is happening in the brain. What is PTSD? Who does it affect? And what is the correlation between PTSD and addiction? The National Institute of Mental Health estimates that 7.7 million Americans, 18 years and older, suffer from Post-traumatic stress disorder (PTSD). According to Science Daily, the number of self-reported PTSD cases has tripled among combat-exposed military personal since 2001.