Kinda of OT for this forum but can't think of anywhere else better to ask this question. My father is 86 and has heated his house with a Nashau wood stove since the mid 70's. He's had COPD for years (chronic bronchitis and emphysema) and it has gotten worse recently. His doctor and me are trying to convince him he needs to stop heating with wood simply because of the ash and other contaminates that inevetablely get into the air (especially from a stove so old) but are having a hard time selling him on doing it. I've been looking around for the net for any kind of studies, or even anadotial stories but haven't hit on much yet. Can anyone here point me anywhere?