Hey folks. I just ran across some information by accident and a bit more thorough search of the internet seems to have positively confirmed it. Apparently cats can react to propylene glycol and from reading online it appears that it may result in a form of anemia. I don't want to freak anyone out or anything because it seems to take a fair amount to have a severely negative effect, just want to put some info out there that I hadn't seen. Dogs and other animals do not seem to have this reaction, it is specific to cats. Of course you'll still want to keep your nicotine away from animals though.
http://www.dow.com/PublishedLiterat...ycol/pdfs/noreg/117-01660.pdf&fromPage=GetDoc
http://www.dow.com/PublishedLiterat...ycol/pdfs/noreg/117-01660.pdf&fromPage=GetDoc