Before igniting the gas, we should make sure that there is no foul smell of the leaking gas. If there is foul smell of gas, then the doors and windows should be opened at once to allow the gas to escape. The gas cylinder, rubber tubing and gas stove should then be properly checked to detect the cause of gas leakage. Preferably a mechanic should be called to set right the defect. The gas should be used only after the defect has been rectified. Never use a leaking gas cylinder.