Yes and no! If you're burning seasoned firewood or even greenwood with low moisture content (16-18%) then yes – there's nothing wrong with using unseasoned split hardwoods because these will produce less smoke than their dry counterparts which contain more creosote overall. However, softwoods like pine should always be dried for longer periods of time since they tend to give off excessive amounts of superheated steam when burned which creates high levels of sticky black tar making your chimney dirtier and therefore your home less safe.