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Authors
Manthey, Jakob https://orcid.org/0000-0003-1231-3760
Klosterhalfen, Stephanie
Kotz, Daniel
Rosenkranz, Moritz
Schranz, Anna
Verthein, Uwe
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Funding
Funding for this research was provided by:
Bundesanstalt für Straßenwesen (FE 82.0816/2023)
Universitätsklinikum Hamburg-Eppendorf (UKE)
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Article History
Received: 24 June 2025
Accepted: 16 October 2025
First Online: 5 November 2025
Declarations
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: Ethical approval was obtained from the Local Psychological Ethics Committee of the Centre for Psychosocial Medicine in Hamburg, Germany (reference number: 0686).All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000.
: Informed consent was obtained from all patients for being included in the study.
: JM has acted as a consultant to national and international health organisations (including the WHO and EUDA). He has been invited as an expert to the Health Committee of the German Bundestag on the subject of cannabis legalisation. JM and DK are principal investigators of the government-mandated evaluation of cannabis legalisation (EKOCAN project) funded by the Federal Ministry of Health of Germany (ZMII2-2525DSM21A). There are no connections to the cannabis industry: no shares, patents, consulting activities or similar. All remaining authors declare no potential conflict of interest.
