‘A man who threw his 11-month-old son into a river believed the baby was turning into the devil....the defendant had suffered from mental health problems throughout his life and at 17 was sectioned and diagnosed with psychosis related to cannabis use.’

https://www.theboltonnews.co.uk/news/18894468.dad-killed-thought-baby-devil/
‘Mr Hall said: “His early life was punctuated with exposures to violence and cannabis use.”
‘He began a relationship with Miss Blood in 2016 and in October 2018 Zakari, their first son, was born. Mr Hall said, following Zakari’s birth, the couple argued and Bennett-Eko began to miss GP appointments and started to consume cannabis again.’
The whole thing is very sad but it shouldn't really come as a huge surprise to people by now that Cannabis use can be linked to psychosis & violence.

https://www.bbc.com/news/uk-england-lancashire-52579120
‘Compared with never-users, continued exposure to cannabis (use at age 18, 32 and 48 years) was associated with a higher risk of subsequent violent behaviour’

https://pubmed.ncbi.nlm.nih.gov/26961342/ 
‘Greater frequency of use of marijuana was found unexpectedly to be associated with greater likelihood to commit weapons offenses; and this association was not found for any of the other drugs, except for alcohol.‘ https://www.tandfonline.com/doi/abs/10.1300/J069v20n01_06
‘Marijuana use was also found associated with commission of Attempted Homicide/Reckless Endangerment offenses.’
‘Marijuana use is associated with changes in impulse control and hostility in daily life.’

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4330120/
‘Adolescent marijuana use, particularly consistent use throughout adolescence, is associated with perpetration or both perpetration of and victimization by intimate partner violence in early adulthood.’
‘Density of medical marijuana dispensaries and delivery services was positively related to frequency of physical abuse.’
‘These results demonstrate a moderate association between cannabis use and physical violence.’

https://pubmed.ncbi.nlm.nih.gov/32456503/ 
‘A significant body of evidence suggests a link between persistent cannabis use and violence among people with mental illnesses’ https://www.nature.com/articles/s41537-020-0104-x
‘Although persistent cannabis use predicted subsequent violence, violence did not predict cannabis use. The relationship was therefore unidirectional.’
The evidence is there if you can be bothered to look for it basically.

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