Eh, okay. I have to admit that this particular sentence:
while there are certainly more harmful chemicals in cigarette smoke, there is a question of safety in e-cigarettes because of the presence of propylene glycol, and other as yet unidentified compounds," Horovitz said.
There be grammar issues! Thank god for the Oxford comma because it kind of reads as if PG is as yet "unidentified" and like, it has a name and stuff. LOL.
Also, if the other as yet are unidentified compounds, I would respectfully ask "Um, how do you know they're there if they are unidentified?" Because if you can't say what they are I'm thinking they are sort of hard to "measure." Also, what specifically is so bad about PG it's used all the time in inhalers and hospitals, etc.
Overall, I did not care for that sentence. I have to say I have a bit of jealousy for those accidental quitters, but I do think it's fantastic. Takes all types of quitting I guess....
Anna