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Authors
Kleine, Ronja https://orcid.org/0000-0002-7585-7936
Isensee, Barbara
Nees, Frauke
Hanewinkel, Reiner
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Funding
Funding for this research was provided by:
Bundeszentrale für gesundheitliche Aufklärung
Universitätsklinikum Schleswig-Holstein - Campus Kiel
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Article History
Received: 12 May 2024
Accepted: 11 May 2025
First Online: 31 May 2025
Declarations
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: Data was gathered from two ongoing trials evaluating the effect of two school-based cannabis prevention programs (“Quo Vadis”, “Methodenkoffer”). Both studies were approved by the ethics committee of the German Society of Psychology (Reference: HanewinkelReiner2020-02-03VA, HanewinkelReiner2021-05-25WV). Prior to implementation, approval was obtained from the relevant authorities in the participating states and the schools consented to participate. Individuals’ participation required written informed consent from the parent/guardian as well as the participating students.
: Not applicable.
: The authors declare that they have no competing interests.
