Home > Medical > Addiction > Dagga 11 May 2019 FEATURE DOCUMENTARY: The evil weed Searching for the truth about cannabis - medicine or a dangerous narcotic? 0 Dr John Marsden searches for the truth about cannabis. Medicine or a dangerous narcotic?Image credit: iStock Related articles Medical marijuana use rising among cancer patients New research indicates that more clinical trials are needed to asses how effective medical marijuana is against cancer-related pain. WATCH: Is medical marijuana a blessing for older Americans? In American states where medical marijuana is legal, there has been a measurable decrease in reported pain for conditions that qualify for dagga treatment. Smoking potent dagga daily raises psychosis risk, study finds The biggest-ever study to examine the impact of marijuana on psychotic disorder rates claims that smoking high-potency dagga every day could increase the chances of developing psychosis by about five times.