More young people are taking part in the potentially unhealthy activity known as vaping.
A 2016 study from the U.S. Surgeon general shows a 900 percent increase in e-cigarette use by high school students between 2011 and 2015.
Doctors at SwedishAmerican says the biggest concern is the sweetener added to e-cigarettes, which are popular among younger users.
Doctors say those sweeteners contain powerful chemicals that have been linked to lung problems.
"Kids recognize how dangerous cigarette smoking is, but when we ask them about vaping they have a completely different attitude, and the notion is, 'well, yeah, it's just water vapor, though, right?' And that's the way that they treat it." Dr. Christopher Rhyne said.
Doctors say another risk from vaping is exposure to heavy metal.