Meh... Chimney fires get all the creosote out. What's the problem?
Oh yeah, that whole part where it's kind of like an upside down solid-rocket motor, and even fire-brick starts to glow...
My friend growing up lived up in the northwoods for the first part of his childhood, and they traded houses with other family during a vacation. The visiting family wanted the ambiance of a fire in their fireplace, but couldn't find their firewood pile.
So the visiting family was rather motivated, and self-starters, so they began cutting up a pile of discarded railroad ties that were left over from a landscaping project my friend's father had been doing.
When they got home from their vacation, every wall in their house was orange from creosote. Oops.