If you have a fireplace that you use in the home that is contributing to poor indoor air quality. Wood smoke contains particles like carbon monoxide, formaldehyde and sulfur dioxide. Wood smoke also contains nitrogen oxides that can cause scarring lung tissue. and contains carcinogenic chemicals such as benzene and dioxin.
Using a furnace for heat could be a safer option but be sure to check for any problems that may cause the furnace not to work properly and to have clean filters. If you have an older furnace it is important to be cautious and inspect more often, maybe even look into a new furnace.