There is always the possibility that your complaining neighbor could sue you about the smoke coming from your fireplace. Whether or not the neighbor is successful seems unlikely. The neighbor will have a hard time proving your presumed legal burning of wood from your fireplace actually caused the aggravation of an existing health condition as opposed to the existing health condition simply degrading.The only thing I suggest is that you are allowed to burn wood in your fireplace when you use it. Some communities preclude the burning of wood on certain days of the year.