• Soziale und gesundheitliche Konsequenzen von Cannabiskonsum
• Epidemiologie von Cannabiskonsum

• Schranz A, Kilian C, Manthey J, Schäfer I, Schulte B, Kraus L (2026) Prädiktoren irregulärer Beendigungen alkoholspezifischer Suchtbehandlungen. Suchttherapie; http://dx.doi.org/10.13039/501100014840
• Manthey J, Kilian C, Kraus L, Schranz A, Schulte B (2026) Utilization of alcohol use disorder treatment during the COVID-19 pandemic in Hamburg, Germany. Drug and Alcohol Review 45, no. 1 (2026): e70107, https://doi.org/10.1111/dar.70107
• Kilian C, Schulte B, Schranz A, Schäfer I, Manthey J (2026) Re-hospitalisation of alcohol use disorder patients with and without qualified withdrawal and rehabilitation treatment. SUCHT; 72, 1, pp. 12–22, doi: 10.1024/0939-5911/a000962.
• Schranz, A., Verthein, U., Rosenkranz, M., Knoche-Becker, A., & Manthey, J. (2025). Correlates of driving under the influence of cannabis: A latent class analysis. J Safety Res, 95, 330-337. https://doi.org/10.1016/j.jsr.2025.10.012
• Manthey, J., Klosterhalfen, S., Kotz, D., Rosenkranz, M., Schranz, A., & Verthein, U. (2025). Legal and Illegal Sources of Cannabis in Germany Shortly After Legalisation. International Journal of Mental Health and Addiction. https://doi.org/10.1007/s11469-025-01574-3
• Rosenkranz M, Schranz A, Verthein U, Schomerus G, Speerforck S, Manthey J (2025) "Those pot heads" - perceived external stigma and self-stigma among cannabis users in Germany: prevalence and associations with socio-demographics, cannabis use patterns and psychological distress. Journal of Cannabis Research;7(1):66. doi: 10.1186/s42238-025-00328-1
• Manthey J, Kilian C, Kraus L, Schäfer I, Schranz A, Schulte B (2025) Identifying levels of alcohol use disorder severity in electronic health records. Subst Abuse Treat Prev Policy; 8;20(1):36. doi: 10.1186/s13011-025-00670-w
• Manthey J, Huß K, Buth S, Kraus L, Schranz A, Kilian C, Gallinat J, Schäfer I, Schulte B (2025) Utilisation of alcohol-related treatment after a first alcohol use disorder diagnosis in Hamburg, Germany. Eur Psychiatry 21;68(1):e21. doi: 10.1192/j.eurpsy.2025.8
• Schranz A, Verthein U, Manthey J. (2024) Road safety implications of the partial legalisation of cannabis in Germany: protocol for a quasi-experimental studyBMJ Open. 2024;14:e084611. doi: 10.1136/bmjopen-2024-084611
• Manthey J, Klinger S, Rosenkranz M. et al. Cannabis use, health problems, and criminal offences in Germany: national and state-level trends between 2009 and 2021. Eur Arch Psychiatry Clin Neurosci (2024). https://doi.org/10.1007/s00406-024-01778-z

Projekte

• EKOCAN - Begleitende wissenschaftliche Evaluation des Konsumcannabisgesetzes
• PRAGMA – Patient:innenwege von Menschen mit einer Alkoholabhängigkeit in Deutschland