Classic psychedelics in the treatment of substance use disorder: Potential synergies with twelve-step programs David B. Yaden, Andrea P. Berghella, Paul S. Regier, Albert Garcia-Romeu, Matthew W. Johnson, Peter S. Hendricks International Journal of Drug Policy, 2021, Doi : 10.1016/j.drugpo.2021.103380   a b s t r a c t Several pilot studies have provided evidence supporting the potential of classic psychedelics like psilocybin in the treatment of substance use disorders (SUDs). If larger trials confirm efficacy, classic psychedelic-assisted psychotherapy may eventually be integrated into existing addiction treatments such as cognitive behavioral therapy, contingency management, and medication-assisted therapies. Many individuals seeking treatment for SUDs also join twelve-step [...]