Cottonwood burns fast, with little odor when well dried.
Cedar would not be a first choice. It will burn very quickly, has relatively low heat values, and will produce a lot of creosote. Can make good kindling.
yes
No it is not safe to burn it.
No, it is not safe to burn. It is toxic.
yes, any fruit wood is safe.
no no no
Yes, it is safe to burn sassafras and it is commonly burned in many locales.
Yes.
yes
Yes.
Yes, it burns very hot. Many find the smell unpleasant, but it is as safe as any other wood to burn.
the wood will burn but the paint will melt .
When the green can be felt such as mold although when it is imbedding in the wood that is arsenic and when you burn it the arsenic is transfered into the air.