Hmmm, I wonder what 'scientific data' will the FDA present during it's rollout of the regs? 
news-medical.net/news/
20140430/Study-Electronic-cigarette-vapors-may-worsen-acute-respiratory-diseases-among-youth.aspx
newsobserver.com/2014
/04/28/3819291/triangle-will-produce-much-of.html

news-medical.net/news/
20140430/Study-Electronic-cigarette-vapors-may-worsen-acute-respiratory-diseases-among-youth.aspx
Electronic cigarette "vapors" are made of small particles containing chemicals that may cause or worsen acute respiratory diseases, including asthma and bronchitis, among youth, according to a new study by RTI International.
newsobserver.com/2014
/04/28/3819291/triangle-will-produce-much-of.html
Other federally-sponsored research on e-cigarettes in the area includes several projects at RTI International at Research Triangle Park, valued at about $3 million.