but teenagers and adolescents pushes them toward e cigarettes. there are other chemicals involved, too. it can effect the brain. it causes addiction issues, can cause learning issues and other drug addiction issues and then the lungs themselves. unlike smoking, it is harder to detect if somebody is vaping. good to see you as always. nbc news medical correspondent. we will follow that development and bring you up to speed. try respect. it works. that s the message from iran s foreign minister to president trump. a series of counter tweets, he warned economic terrorism and genocidal taunts won t end iran. over the weekend, security officials said iraqi officials said a rocket landed near the u.s. embassy in baghdad. no one claimed responsibility for that rocket, but shortly after the attack the state department cautioned that it would respond accordingly if any of iran s proxy militia forces who are known to operate in iraq were involved.