[Editorial] Clearing the haze around medicinal cannabis (Lancet Neurology)

Cannabis is legal for medicinal use or is decriminalised for recreational use in more than half of the states in the USA, in more than 10 European countries, and in Australia. On July 1, 2018, the Canadian federal government will legalise recreational use of cannabis. The increased availability of cannabis following legalisation raises questions about its implications for public health, but it also opens avenues for treatment of neurological conditions. There is some evidence that various forms of cannabis could be used to treat neurological disorders--including epilepsy and some symptoms of multiple sclerosis (eg, spasticity and pain)--and for palliative care, but medical guidelines for its use are scarce.