They probably say non-toxic becuase of, again, the question of when does a concentration become toxic. It's like saccrine- yes, it will give a mouse cancer. If you eat your own body weight of the same thing every day it will give you cancer, even if it's wheat bran. :P
With military solid fuels, it becomes an issue becuase people who are in places where they are effectively seiged in, or just flat out under seige, don't like to go out where the bullets are just to make coffee. I remember reading years ago that hexi and triox had been pointed at in a small number of Vietnam veterans' kindey and/or liver damage caused by formeldahyde injestion, but I also seem to recall stories about this beer brewed in the Republic of Vietnam where the special ingrediant WAS formheldahyde. Thats probably the reason any attempts to get it covered by the VA was backburnered, or at least you don't hear about it- it wasn't like defoliant exposure, who get's a cup of Agent Orange to go?
But even if it was caused by fuel tabs, it was becuase people were using it in bunkers and hooches on a regular and prolonged basis, which isn't what the stuff was designed for. Open air and you are fine.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.