The new iolite liquid has both pg and vg, but as Frog has already pointed out the thermo regulated 190 degrees running temperature is well below the tipping point at which VG converts to acrolein. 
In fact I suspect you have more chance of this happening with an ecig by holding down a manual switch for extended periods.... ever wondered what that funny smell was when you try to clean your atomiser by burning it dry?....
Acrolein is also one of the many byproducts of cigarette smoking, but funnily enough I never even knew about it until I started e-smoking and getting all health conscious like.
It also appears there is little to no evidence to suggest it is a carcinogen although inhaling vast quantities clearly isn't good:
Acrolein is an intense irritant and displays a range of toxic effects.
Levels of acrolein in cigarette smoke are 18–98 μg per cigarette. Acrolein is an intense irritant and displays a range of toxic effects, including cilia toxicity. With the exception of one study in which bladder tumors were produced by an initiation–promotion protocol in rats treated with acrolein (by i.p. injection) followed by dietary uracil, no carcinogenic effects of acrolein have been reported, perhaps because of efficient scavenging by glutathione and related sulfhydryls . An International Agency for Research on Cancer working group concluded that there was inadequate evidence for its carcinogenicity in experimental animals . Acrolein is widely believed to be responsible for the bladder toxicity of the chemotherapeutic agent cyclophosphamide. Thus, in laboratory animals, the carcinogenicity of acrolein, if it exists at all, is clearly substantially less than that of PAH or tobacco-specific nitrosamines.
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