National Academies of Sciences Confirms Marijuana's Benefits, Dispels Myths

The National Academies of Sciences released a report on the health impacts of marijuana Thursday, confirming the existence of medical benefits and dispelling some long-held myths about the substance.

The review of more than 10,000 scientific abstracts found, “There is conclusive or substantial evidence that cannabis or cannabinoids are effective” for the treatment of chronic pain in adults, chemotherapy-induced nausea and vomiting, and multiple sclerosis spasticity.

The report also dispels several myths about the health impacts of marijuana. It found no links between smoking marijuana and the development of lung, head, or neck cancers, nor did it establish a link between marijuana use and asthma or other respiratory diseases. The respiratory problems that it did link to smoking marijuana, such as bronchitis, appear to improve after the consumer ceases their use.

According to the report, “There is no or insufficient evidence” linking marijuana use to all-cause mortality (death), deaths from overdose, or occupational accidents or injuries. It also found no substantial evidence of a link between the use of marijuana and the use of other illegal drugs. The report also does not appear to make any links between marijuana use and violent or aggressive behavior. Several of these findings were also included in the National Academies of Sciences’ previous report on marijuana, which was released in 1999.