Almost 40 percent of teens who use e-cigarettes say seeing their peers use the devices led them to try vaping themselves, a new government report finds.

Teens who try e-cigarettes are often tempted by the flavors of vaping liquids, and some believe e-cigarettes are safer than traditional cigarettes, HealthDay reports. E-cigarettes are the most commonly used form of tobacco among middle school and high school students, according to the report by the Centers for Disease Control and Prevention.

In 2016, a report by the U.S. Surgeon General called for reducing e-cigarette use among young people. The report said young people are more vulnerable than adults to the negative consequences of nicotine exposure. “These effects include addiction, priming for use of other addictive substances, reduced impulse control, deficits in attention and cognition, and mood disorders,” the report stated.