More than half the states in the US now allow the use of marijuana for medical purposes, as well as at least 16 other countries. Yet of the hundreds of purported medical benefits, only three are concretely supported by scientific evidence: treating chronic pain, nausea after chemotherapy, and symptoms of multiple sclerosis. This is the conclusion of a new 400-page report from the US National Academies of Science, Engineering, and Medicine, which analyzed more than 10,000 scientific studies.
One of the biggest benefits of such large reviews is that they put in context the weight of evidence supporting the many claims made in the name of cannabis. To help you understand those, we’ve coded the claims about both benefits and harms of cannabis. The ones with the strongest evidence are in bold, those with mild evidence in normal text, and those with limited or no evidence grayed out.
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