An Empty Space Under a Campfire Causes It To Not Produce Smoke

Military survival training includes instruction on creating the "Dakota Fire Pit", which involves digging a hole for the fire itself, and a second hole to draw air in from below.

From Wikipedia, "The fire burns from the top downward, drawing a steady, laminar stream of fresh air from the air hole as it burns. Because the air passes freely around the fuel, near complete combustion is achieved, the result being a fire that burns strongly and brightly and with little or no seen smoke."

In Minecraft, this could translate to simply leaving an empty space below the Campfire block.

I feel this mechanic could be added to the game to, among other things, alleviate player complaints about smoke generation in small fireplaces.