To ask the Secretary of State for Health what studies his Department has (a) commissioned and (b) received regarding the links between cannabis and schizophrenia; and if he will place a copy of these studies in the Library.
The Department commissioned and received the following research projects as part of the drug misuse policy research initiative, which funded £2.4 million research between 2000 and 2003.
Long term heavy cannabis use: patterns and problems. Mr. Niall Coggans, Strathclyde Institute for Biomedical Sciences.
A national epidemiological study of dually diagnosed substance misuse and psychiatric disorders between 1993–98, using the General Practice Research Database. Dr. Martin Frischer, Keele University.
Co-morbidity in the National Psychiatric Morbidity Surveys. Dr. Michael Farrell, Dr. Colin Taylor, Institute of Psychiatry.
Co-morbidity of substance misuse and mental health problems: a study of the prevalence and patterns of co-morbidity and the need for services among treatment populations. Mr. Tim Weaver, Imperial College School of Medicine.
Dual Diagnosis in a Primary Care Group (PCG), (100,000 population locality): a step-by-step epidemiological needs assessment and design of a training and service response model. Dr. Geraldine Strathdee, Oxleas National Health Service Trust. In addition, the Department has recently commissioned, jointly with the Medical Research Council, a multi-site, randomised controlled trial: "Evaluating a psychological intervention for clients with schizophrenia and co-morbid substance abuse". Copies will be placed in the Library.
The Department also monitors research in this area and has a range of expert advisers to inform policy.