Patients must have access to reliable guidance about medical cannabis from their doctor, say the authors.
Medical cannabis is not associated with an increased risk of psychiatric hospitalisations.
We round up the latest research to have on your radar.
Synthetic cannabinoids appear to have less appeal in states which have legalised natural cannabis.
"In terms of mental health problems, cannabis appears to be at least as safe as the legal drugs alcohol and tobacco."
Researchers believe cannabis may help mitigate symptoms such as nasal congestion.
The findings, which link cannabis with higher rates of cancer than tobacco, have been described as "unsubstantiated".
The new legislation will encourage research on cannabis by removing some of the current barriers.
The first patient has been enrolled in the trial in what has been described as a “key milestone”.
A new study has highlighted concerns about stronger forms of cannabis, pointing to the need for a regulated market.