Electronic Cigarettes a Safety Issue on Aircraft

"DOT is determined to keep America’s airlines the safest in the world.  It is with that thought in mind that the Pipeline and Hazardous Materials Safety Administration, in coordination with the Federal Aviation Administration, issued a final rule on May 13, 2016, prohibiting the carriage of battery-powered portable electronic smoking devices (e.g. e-cigarettes, e-cigs, e-cigars, e-pipes, personal vaporizers, electronic nicotine delivery systems) in checked baggage.  This includes prohibiting the charging of such devices and batteries aboard aircraft...: 
Electronic cigarettes