(New Scientist) Don't expect marijuana to perform medical miracles. That's the message from a huge review of 79 clinical trials undertaken between 1975 and 2015 that assessed the merit of taking cannabinoids – the active component in cannabis – to treat different health conditions.
Over the last 20 years, Washington DC and 23 US states have introduced laws to allow the use of medical marijuana to treat many conditions, including long-term pain, sleep problems and muscle disorders.
Penny Whiting of the University of Bristol, UK, and her colleagues set out to examine the evidence that the drug is actually beneficial, but found little to suggest it is.
Advertisement - story continues below