The following table shows the number of finished admission episodes with a primary diagnosis recorded for cannabis use, in each of the last five years:

Source: NHS England publishes information on hospital admissions, which is available at the following link: https://digital.nhs.uk/data-and-information/publications/statistical/hospital-admitted-patient-care-activity

The Home Office commissioned Dame Carol Black in 2019 to undertake a 2-part independent review of drugs, which informed the government’s 10 year Drug Strategy. The review included information on different illegal drugs, including cannabis markets and links to exploitation and violence. The evidence pack is published at: assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/882953/Review_of_Drugs_Evidence_Pack.pdf.

In this review it was found that the available data indicates that cannabis markets, while associated with violence, are less closely linked to violence than the markets for heroin/crack and powder cocaine.

Further analysis undertaken by the Home Office was conducted on the risk factors for behaviours related to serious violence, which is published here and includes an assessment of drug use as a risk factor:

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/819840/analysis-of-indicators-of-serious-violence-horr110.pdf