Veröffentlichungen

Zweiter Zwischenbericht zur Evaluation des Konsumcannabisgesetzes (EKOCAN) (veröffentlicht am 01.04.2026)

Erster Zwischenbericht zur Evaluation des Konsumcannabisgesetzes (EKOCAN) (veröffentlicht am 29.09.2025)

Hier finden Sie Studienprotokolle zu verschiedenen Teilbereichen des Projekts. Sie dokumentieren unter anderem die jeweiligen geplanten Erhebungs- und/oder Auswertungsschritte für verschiedene Datenquellen.

Studienprotokoll zur Befragung von Konsumierenden und nicht-Konsumierenden

Supply and demand of medical cannabis in Germany after legalisation: exploring 12 months of data from an online dispensary

Manthey, J., Giesmann, M., Verthein, U. & Kilian, C. (2026). International Journal of Drug Policy, 155, 105417. https://doi.org/10.1016/j.drugpo.2026.105417

Increase in Cannabis-Specific Hospital Admissions After Partial Legalization in Germany: A Nationwide Time-Series Analysis

Manthey, J., Radas, S. & Kraus, L. (2026). Dtsch Arztebl Int 123(15). https://doi.org/10.3238/arztebl.m2026.0123

Short-term effects of cannabis legalisation in Germany on driving under the influence of cannabis: a difference-in-differences analysis using Austria as a control

Schranz, A., Knoche-Becker, A., Rosenkranz, M., Verthein, U., & Manthey, J. (2026). The Lancet Regional Health - Europe, 63, 101593. https://doi.org/10.1016/j.lanepe.2026.101593

Konsumcannabisgesetz - erste Ergebnisse der Evaluation

Iberl, B., Kinzig, J., Rebmann, F., Ribeiro Marques, C., & Schreier, S. (2025). Deutsche Richterzeitung (DRiZ) 103 (11), S. 414-419.

Legal and Illegal Sources of Cannabis in Germany Shortly After Legalisation

Manthey, J., Klosterhalfen, S., Kotz, D., Rosenkranz, M., Schranz, A., & Verthein, U. (2025). Int J Ment Health Addiction. https://doi.org/10.1007/s11469-025-01574-3

Correlates of driving under the influence of cannabis: a latent class analysis

Schranz, A., Verthein, U., Rosenkranz, M., Knoche-Becker, A., & Manthey, J. (2025). J Safety Res, 95, 330–337. https://doi.org/10.1016/j.jsr.2025.10.012

What proportion of people who use cannabis in Germany have spoken with their general practitioner about their consumption? A repeated cross-sectional representative population survey

Borchardt, B., Klosterhalfen, S. & Kotz, D. (2025). J Cannabis Res 7, 76. https://doi.org/10.1186/s42238-025-00329-0

“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

Rosenkranz, M., Schranz, A., Verthein, U., Schomerus, G., Speerforck, S., & Manthey, J. (2025). J Cannabis Res, 7, 66. https://doi.org/10.1186/s42238-025-00328-1

Germany's cannabis act: a catalyst for European drug policy reform?

Manthey, J., Rehm, J., & Verthein, U. (2024). The Lancet Regional Health - Europe, 42, 100929. https://doi.org/10.1016/j.lanepe.2024.100929

Cannabis Use in Germany: Frequency, Routes of Administration, and Co-use of Inhaled Nicotine or Tobacco Products

Kotz, D., Kastaun, S., Manthey, J., Hoch, E., & Klosterhalfen, S. (2024). Dtsch Arztebl International, 121(2), 52–57. https://doi.org/10.3238/arztebl.m2023.0237