Cooking using LPG (Liquid Petroleum Gas) produces no smoke filled with solid particles which are extremely harmful for health. However, cooking with LPG is not a luxury for people in the developing world. However, the World LP Gas Association (WLPGA) recently announced that it would soon be launching a five year campaign to bring LPG and clean and efficient cooking to developing countries where people still use inefficient and health-damaging fuel like wood. Read more here.