The old stoves are nice but the new stuff destroys the older stuff on efficiency and emissions. If your stove doesn't have air tubes or a catalytic converter your using way more wood and sending 5-6 times the amount of smoke/particulate into the airm
My newer insert literally has zero smoke coming out of it once its up to temp. The tubes on top inject air and burns up the smoke like a blowtorch extracting even heat from the smoke.
Some studies have shown a reduction almost 50% in wood consumption as well.
Today’s wood stove models feature improved safety and efficiency--they produce almost no smoke, minimal ash, and require less firewood. While older uncertified stoves release 15 to 30 grams of smoke per hour, new EPA-certified stoves produce no more than 4.5 grams per hour.
https://www.epa.gov/burnwise/choosing-right-wood-burning-stove