Quote Originally Posted by epicsoundz69
It wouldn't just evolve to spit fire if it still burned its throat and shit no? Maybe they could've developed a way to combine two reactive chemicals made by its body into a stream coming out of glands in its mouth.

Snakes spit venom, why couldn't a highly evolved giant reptile spit chemicals?
Spitting chemicals is one thing. Getting those chemicals to catch fire and not have a significant chance of severely burning you is another. I don't see how such an ability could possibly evolve. The first lizards to learn how to create the first rudimentary flames are likely to just burn themselves or their potential mates. This would not be a useful ability that would give fire-breathing genes a greater chance of survival than non-fire-breathing genes. If one misdirected breath can make you burn off your balls or cause a huge forest fire, how long are you going to stick around?