As health concerns mount over the rise in teenage vaping, CNN, CBS and Viacom are ending advertisements by e-cigarette companies.

The parent company of CNN, WarnerMedia, said on Wednesday that it was removing the ads from its entire portfolio of networks, including TNT and TBS, in response to recent health warnings from authorities including the American Lung Association and the Centers for Disease Control and Prevention.

“We will continue to monitor the investigations by relevant medical agencies and may re-evaluate our position as new facts come to light,” Jennifer Toner, a company spokeswoman, said in a statement.

A spokesman for CBS said Wednesday the network would also no longer accept the advertisements. Viacom — which owns the MTV, Nickelodeon and BET networks — took the same stance.