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Published online 2 November 2000 | Nature | doi:10.1038/news001102-8

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Highs and lows

David Adam reports on efforts to pin down cannabis' influence on asthma sufferers.

Researchers studying the action of cannabis-like molecules may have cracked why the drug performs in wildly conflicting ways in some clinical studies. Smoking marijuana can dilate human airways, so many people have suggested that it could be used to treat chest complaints, including asthma.

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