@donnaturn I cannot say that I have read anything either - curious as we need to be so cautious.
But it is a non-issue for me after a lifetime of asthma and allergies. We gave up using our airtight woodstove at least 20 years ago, after heating our home with it for years, when we realized it was causing lung problems.

If you have underlying asthma, allergies or COPD any pulmonologist or allergist will say burning wood is not a good idea. But, as with anything else, the occasional recreational fire probably isn't a huge risk, unless your lungs react. Fireplace logs are typically made from sawdust/wood shavings/paraffin or wax and sometimes scents - quite possibly cleaner than firewood that has been outdoors.

Are you referring to recreational use, like a fire on Christmas Eve, or heating with wood?
Sue