Manila — Philippines President Rodrigo Duterte said he will stop the importation of e-cigarettes and prohibit their use in public after a teenager contracted a lung illness tied to vaping.

“I will ban it, the use and the importation,” Duterte said at a televised briefing on Tuesday evening. “I am now ordering the law enforcement agencies to arrest anybody vaping in public.” E-cigarettes contain “nicotine and other chemicals that we do not know”, he said...