They make a pill for that.
Buuut seriously, If you do go the green wood route, shave the bark off the pieces and preheat them. You can remove a lot of the moisture and watch the color of the smoke. Acrid smoke means creosote.
Weber WSM, Weber GA, Weber Spirit S-320
Charbroil Oilless Turkey Fryer
Wife LuzziAnn 1956 model.
Maverick ET-732, Superfast LSU Purple Thermapen & ThermaPop, Party Q