Saw an article about cleaning chimneys. It recommended having your chimney checked and inspected at least once a year, if you are burning wood.

Chimney fire can burn your house to the ground. It can also ruin the chimney, even if the house survives. This can cost thousands and thousands of dollars. 

Besides, you have a fire to enjoy the day, not be scared to death. Chimney inspection is not expensive, but make sure you don't call a ripoff company. They will try to sell you expensive repairs you may not need.

Chimney sweep