The use of medical marijuana to relieve pain and other disease symptoms can cause a huge range of adverse effects, says an analysis of safety studies co-authored by University of B.C. and McGill University researchers.

The researchers evaluated 31 studies done around the world during the past 40 years and found that while nearly 97 per cent of adverse events were not serious or life threatening, medicinal marijuana users still have an 86-per-cent increase in the rate of non-serious adverse effects like drowsiness and dizziness compared to non-users, according to the study in the June 17 Canadian Medical Association Journal. Read the rest of the story here.