Teens who watch an advertisement on TV for electronic cigarettes are more likely to try them in the future, according to a new study published in the American Journal of Preventive Medicine.

Adolescents exposed to four e-cigarette ads reported a 50% higher likelihood of future use. The same group was also more likely to have positive attitudes about e-cigarettes.

“Compared with adolescents in the control group, those experimentally exposed to e-cigarette advertising were significantly more likely to believe that e-cigarettes are safer than cigarettes, can be used where smoking is not allowed, can be used without affecting those around them, and are a good way to express their independence,” the study said.