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Various studies suggest the vapors from e-cigarettes contain several cancer-causing substances, as well as incredibly tiny particles of tin, chromium, nickel and other heavy metals, which, in large enough concentrations, can damage the lungs. These particles likely fleck off the solder joints or metal coil in the devices when heated. Because they are so small, the tiniest bits of metal, known as nanoparticles, can travel deep into the lungs. There they could exacerbate asthma, bronchitis—an inflammation of the tubes that carry air to and from the lungs—and emphysema—a disease in which the lungs' many air sacs are destroyed, leaving patients short of breath. So far there are not enough data to say with certainty whether e-cigs worsen these disorders. E-cigarettes have a battery-operated component that heats liquid containing nicotine, flavorings, and other chemicals.

Electronic cigarettes produce an aerosol by heating a liquid that usually contains nicotine, flavorings and other chemicals. Richmond-based Altria previously took a $13 billion stake in Juul in 2018, when the brand controlled most of the U.S. vaping market. But Juul’s value plummeted after it was hit with lawsuits and investigations over its role in sparking a national spike in underage vaping.

"Vaping products containing nicotine are subject to federal laws that prohibit sales to people under the age of 21," said study co-author Sairam V. Jabba, D.V.M., Ph.D., a senior research scientist at Duke University School of Medicine. "Even with the current relatively low use of e-cigarettes among adults&nbsp