I of course don't have a link, and I can't find one, so if someone could throw it up if they have it. Yeah, It's basically saying that even though propylene glycol is GRAS (generally recognized as safe) by the FDA, there isn't enough evidence to support that it's safe to inhale. There's also a blurb about how the regulations of the e-cig industry is like the 'Wild West' (actual wording). UGH... Really SA? 