{Reference Type}: Journal Article {Title}: Does cannabis use substitute for opioids? A preliminary exploratory survey in opioid maintenance patients. {Author}: Bekier NK;Frischknecht U;Eidenmueller K;Grimm F;Bach P;Stenger M;Kiefer F;Hermann D; {Journal}: Eur Arch Psychiatry Clin Neurosci {Volume}: 0 {Issue}: 0 {Year}: 2024 Mar 19 {Factor}: 5.76 {DOI}: 10.1007/s00406-023-01718-3 {Abstract}: Various studies showed that people with substance use disorder use cannabis to reduce withdrawal or dose of their main drug. Using a questionnaire about their cannabis use, 118 participants in an opioid maintenance treatment (OMT) in Germany were examined regarding this strategy. 60% reported to use cannabis. Of those, 72% were using cannabis in the suggested way. Cannabis was used to substitute for, e.g., heroin (44.8%) and benzodiazepines (16.4%). We also asked for an estimation of how good cannabis was able to substitute for several substances (in German school grades (1 till 6)); heroin average grade: 2.6 ± 1.49. Besides that we asked about the idea of cannabis as "self-medication", e.g., to reduce pain (47%) and about negative consequences from cannabis use. Our results suggest to consider the use of cannabis by patients in OMT rather as a harm reduction strategy to reduce the intake of more dangerous drugs.