Everything we learned about the health effects of marijuana in 2017

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In 2017, some Americans could buy legal marijuana almost as easily as they could order a pizza. Pot shops outnumber Starbucks stores in states like Colorado and Oregon, and medical marijuana delivery services drop the drug off at people’s doors in California and Massachusetts.

With marijuana now more accessible — legally — than ever, more researchers are weighing in on its health effects. But that doesn’t mean we fully understand the plant or its impacts.

The National Academies of Sciences, Engineering, and Medicine released a massive report in January that gives one of the most comprehensive looks — and certainly the most up-to-date — at exactly what we know about the science of cannabis. The committee behind the report, representing top universities around the country, considered more than 10,000 studies for its analysis and drew nearly 100 conclusions. Many of those findings are summarized below.

In the short term, marijuana can make your heart race.

In the short term, marijuana can make your heart race.

Within a few minutes of inhaling marijuana, your heart rate can increase by between 20 and 50 beats a minute. This can last anywhere from 20 minutes to three hours, according to the National Institute on Drug Abuse.

The report from the National Academies found insufficient evidence to support or refute the idea that cannabis might increase the overall risk of a heart attack. The same report, however, also found some limited evidence that smoking could be a trigger for a heart attack.

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