Question to the Home Office:

To ask the Secretary of State for the Home Department, with reference to the Independent review of drugs by Professor Dame Carol Black, if his Department will commission further research on the potential impact of the use of (a) skunk and (b) all other cannabis on levels of psychosis.

Dame Carol Black’s independent review of drugs noted that cannabis poses a large number of health risks, including psychological and respiratory disorders, particularly given increases in potency. There is a growing body of evidence that indicates a link between cannabis and psychosis which underlines the importance of our approach to tackling its misuse. Cannabis continues to be the most commonly used drug and around 21% of adults starting drug treatment between 2021 and 2022 said they had a problem with cannabis use.

For this reason, cannabis is controlled under Class B of the Misuse of Drugs Act 1971. There is clear scientific and medical evidence that cannabis is a harmful drug which can damage people’s mental and physical health, and harms people and communities.

At the UK Drugs Ministerial in November 2023, the latest research findings into the links between cannabis and psychosis were presented by a leading academic and those findings are informing policy making. The department has no current plans to commission further research into the links between cannabis and psychosis but continues to keep all drugs under review and will consider all evidence as appropriate.