“…Additionally, childhood trauma adversely affects endocrinological functioning and the stress response (Kempke et al, 2015), and the prevalence of childhood trauma is high amongst the homeless (Sundin & Baguley, 2015), and the incarcerated (Singleton, Meltzer, & Gatward, 1997), contributing to people with serious multiple deprivations, including substance use problems, homelessness, mental health problems and prison records (Bramley et al, 2015). Drugs and alcohol can also be used as avoidant coping to escape the intrusive thoughts and feelings of PTSD (Brady & Back, 2012;Garland, Pettus-Davis, & Howard, 2013). Moreover, childhood trauma additionally worsens the progression and outcome of problematic drug use (Heffernan et al, 2000;Lake et al, 2015).…”