Oh alright fine I had my fun but this seems to be a genuine question not a troll so here you go.
Basically, don't worry about it, the median lethal dose or LD50 (the amount of a chemical necessary to be lethal in 50% of a population) is very high for each of the three most prominent chemicals in lubricants (aside from water and silicone which I assume you already know are non-toxic)
Propylene Glycol, Glycerine, and Methyl Parabens have all been tested extensively on animals and their oral toxicity is extremely low.
The LD50 are as follows:
Propylene Glycol 18000 mg/kg
Glycerine 12600 mg/kg in rats
Methyl Parabens 8000 mg/kg in mice
Source: National Library of Medicine's ToxNet
http://toxnet.nlm.nih.gov/cgi-bin/si...erm+@DOCNO+492
http://toxnet.nlm.nih.gov/cgi-bin/si...erm+@DOCNO+174
http://toxnet.nlm.nih.gov/cgi-bin/si...rm+@DOCNO+1184