Background: The association between cannabis use and positive symptoms in schizophrenia spectrum disorders is well documented, especially via meta-analyses. Yet, findings are inconsistent regarding negative symptoms, while other dimensions such as disorganization, depression, and excitement, have not been investigated. In addition, meta-analyses use aggregated data discarding important...
There has been a considerable amount of debate among the research community whether cannabis use may cause schizophrenia and whether cannabis use of patients with schizophrenia is associated with earlier and more frequent relapses. Considering that studies exploring patients' view on controversial topics have contributed to our understanding of important clinical issues, it is surprising how...
The present review focuses on articles dealing with clinical or epidemiological studies on the association between cannabis use and psychoses. Included are all articles published since 1990 that were located by a Medline or Psyclit data-base research and those earlier articles that are needed for a correct understanding of studies published during the index episode. The three main topics found...