This is a confusing article, they bring bring up that "particles" were found in vapor - which could carry potentially harmful chemicals into the lungs ... then say they didn't find any potentially harmful chemicals 
philly.com/philly/health/HealthDay687570_20140507_E-Cigarette_Vapor_Contains_Potentially_Harmful_Particles__Review.html
They also falsely claim that eliquid contains "glycol ethers"
RTI has been contracted by FDA to conduct ecig studies
http://www.e-cigarette-forum.com/forum/fda-regulations/558393-study-one-fdas-sponsored-labs.html

philly.com/philly/health/HealthDay687570_20140507_E-Cigarette_Vapor_Contains_Potentially_Harmful_Particles__Review.html
They also falsely claim that eliquid contains "glycol ethers"

RTI has been contracted by FDA to conduct ecig studies
http://www.e-cigarette-forum.com/forum/fda-regulations/558393-study-one-fdas-sponsored-labs.html