Any kind of wood is safe to burn in your fireplace as long as its dried to approx 18% moisture content, and does not contain any man made chemicals like pressure treated wood. Lumber should also be avoided for anything other then a firestarter because its dried to 5% and can over fire and damage some stoves and fireplaces.
Number one rule, is avoiding green wood (green wood being freshly cut wood or wood with a high moisture content) in any appliance. Other then that any wood, including pine, is safe to burn. Its a myth that pine contains more creosote, the reason its less desirable then other hardwoods is that its less dense, therfore contains less btu's then similar sizes of hardwood. Pine cones (dried) can also be used and they give a nice pine fragrance when being burnt.
yes. i don't think so
Yes
I do - smells lovely!
No, it is not safe to burn. It is toxic.
Yes.
yes
Yes.
yes, any fruit wood is safe.
Yes.
Yes
Yes, it is safe to burn sassafras and it is commonly burned in many locales.
no it will catch a your house on fire