Promise and perils of marijuana deserve more scientific scrutiny
Limits on ability to study drug hamper efforts to weigh public health benefits, concerns
![marijuana](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/01/011217_bb_marijuana_free.jpg?fit=860%2C460&ssl=1)
HIGH HOPES Cannabis plants such as this one yield marijuana and other substances that deserve expanded study for possible medical benefits, a large research review recommends. But negative physical and psychological effects of cannabis products can’t be ignored, the report says.
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