I downloaded a brochure by Chevron that said that additives were in PPM.
I looked at many (not all are available on the internet) of the MSDS (Manufacturers Safety
Data Sheets) for the additives, and in particular the two biocides, and none were carcinogenic. All were irritants. Inhalation in large quantities can cause chemical pneumonia. Also in large quantities there can be CNS reactions. These are exactly the same risks as the underlying fuel, which is of course considered toxic. Which is to say that the additives do not change the kind of toxicity, nor are they particularly more potent than the kerosene. But of course there is always toxicity with kerosene.
Frankly I have wasted enough time on this. If there are those who want to use jet fuel for their lamps/stoves then take a look at the MSDSs yourself. Start with wikipedia to get a list of additives and go from there. Personally I don't see the point, unless there is no other choice - in which case I would use it to get by until I could track down kerosene.