My 5 yo daughter had a routine appointment with her pediatrician earlier this week. One question that took me by surprise was whether we burned wood for heat. I've never had an ounce of worry about burning and effects on our health. Am I missing something? (As a side note, when my daughter heard the question, she promptly answered, "Yes, the wood stove is in the play room." I got a look from the assistant, and another look when I told her we also heat with pellets.)