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Scientists are finding that, just as with secondhand smoke from tobacco, inhaling secondhand smoke from marijuana can make it harder for arteries to expand to allow a healthy flow of blood. Maren Caruso/Getty Images hide caption

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Maren Caruso/Getty Images

Are There Risks From Secondhand Marijuana Smoke? Early Science Says Yes

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A JUUL e-cigarette for sale at Fast Eddie's Smoke Shop in Boston. The sleek devices are easy to conceal, which makes them popular with teenagers. Suzanne Kreiter/The Boston Globe via Getty Images hide caption

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Suzanne Kreiter/The Boston Globe via Getty Images

The state of New York is putting e-cigarettes into the same category as regular tobacco cigarettes, under new restrictions signed into law this week. Here, a man uses a vape device in London last summer, next to a No Smoking sign. Tolga Akmen/AFP/Getty Images hide caption

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Tolga Akmen/AFP/Getty Images

The liquid used in e-cigarettes comes in fruit and candy flavors like cherry and peppermint. Paul J. Richards/AFP/Getty Images hide caption

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Paul J. Richards/AFP/Getty Images

Teens' Use Of E-Cigarettes Drops For The First Time, CDC Says

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California is the second state to raise the legal age for purchasing tobacco products from 18 to 21. A similar law went into effect in Hawaii on Jan. 1. Paul J. Richards/AFP/Getty Images hide caption

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Paul J. Richards/AFP/Getty Images

E-cigarettes work by heating up a fluid that contains the drug nicotine, producing a vapor that users inhale. The devices are most popular among young adults, ages 18 to 24, a federal survey indicates. iStockphoto hide caption

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iStockphoto

Most E-Cigarette Users Are Current And Ex-Smokers, Not Newbies

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Vapor from an e-cigarette obscures the user's face in a London coffee bar. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images

E-Cigarettes Can Churn Out High Levels Of Formaldehyde

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Jonathan Franzen, pictured here at The New Yorker Festival Fiction Night in 2009, won the National Book Award for his third novel, The Corrections. Joe Kohen/Getty Images hide caption

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A woman tries electronic cigarettes at a store in Miami. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

FDA Moves To Regulate Increasingly Popular E-Cigarettes

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