Cannabis and psychosis

Some research suggests that cannabis use—especially if heavy and regular—may be linked to a condition known as a drug-induced psychosis, or "cannabis psychosis". This can last up to a few days. The episodes are often characterised by hallucinations, delusions, memory loss and confusion.

There is some evidence that regular cannabis use increases the likelihood of psychotic symptoms occurring in an individual who is vulnerable due to a personal or family history of mental illness. Cannabis also appears to make psychotic symptoms worse for those with schizophrenia and reduces the chances of recovery from a psychotic episode.

Medicinal use of cannabis

Cannabis has been used for medicinal reasons for many centuries. There is evidence to suggest it is useful in providing relief from nausea and vomiting caused by chemotherapy, wasting and severe weight loss, pain, glaucoma, and epilepsy