With flavors like cake batter, raspberry doughnut and popsicle, many parents have learned that their children may be lured into trying the flavored cartridges in electronic-cigarettes.

E-cigarettes, or vape-pens, usually contain nicotine and can be bad for one’s health, according to Overlake Medical Center’s Dr. Todd Freudenberger, a pulmonary medicine specialist and lung cancer expert who spoke to students on Friday during the Environmental and Adventure School’s Healthy Choices Fair.

“Every day in my clinic I take care of people with diseases related to the use of tobacco, they have fallen into the trap of tobacco products,” Dr. Freudenberger told the students. He described the known risks of nicotine use including addiction and accelerated heart rates along with the components of e-cigarettes such as propylene glycol that when heated could produce byproducts that are known to cause cancer in people.

“Can everyone get addicted to nicotine?” one student asked.

“Is vaping dangerous if there is no nicotine?” another asked.

“The kids are very interested in this topic, they know that cigarette smoking is bad, but there’s confusion about vapes,” EAS parent Laureen Miki said. “These kids are coming away from this saying that, ‘It’s dangerous, plus the companies are marketing to us directly and trying to make us the next generation!’”

A report from the U.S. Surgeon General found electronic cigarette use grew 900 percent among high school students from 2011 to 2015. In 2015, about 1 in 6 high school students used e-cigarettes in the past 30 days.