You should ask Mr. Terry Pratchett, or better yet, read "Guards! Guards!" You will learn dragons, at least those of the Draco Vulgaris (swamp dragon) kind can readjust their internal plumbing in ways that allow them to convert almost every (in-)edible thing into fire. What may seem like an advantage to you usually ends up being a disadvantage to the dragon since they've never really mastered the art of chemistry, AS
A CERTAIN INDIVIDUAL WHO ALWAYS SPEAKS IN
CAPITALS WOULD AGREE.
Don't cry because it's over, smile because it happened.