A blocked chimney will allow smoke and carbon monoxide into your home which is dangerous for your health and may cause a fire. At the same time, the smoke and creosote from the fireplace can damage your home furnishings too. Just Imagine the smell of smoke at every corner of your home that can even get to your lungs. Another safety hazard is using highly combustible materials near your fireplace. Fires due to fireplaces happen when it’s not properly maintained by professionals and dangerous gases start to enter your home.