DThe United Nations International Narcotics Board found in March 2023 that the legalization of cannabis in affected countries has led to an increase in consumption, with serious psychosocial harm, particularly among children and young people. This was recently confirmed by Sir Robin Murray and his international team of researchers, based on a large number of scientific studies and meta-analyses at the World Congress of Psychiatry. The number of emergency medical admissions and sometimes fatal traffic accidents has also increased due to legalization. What is particularly harmful is that the content of tetrahydrocannabinol (THC) has increased several times since the early 1970s. THC is the cannabinoid most likely to cause brain damage and chronic psychotic illness.
The German Society for Psychiatry, Psychosomatics, Psychotherapy and Neurology (DGPPN), on behalf of numerous medical societies, claims that in Germany too, legalization in the form currently envisaged will lead to serious health and psychosocial harm, especially among young people.