why do we not use coal gas as a cooking fuel??? Share with your friends Share 4 Malvika Tripathi answered this Dear user,There are some disadvantages of coal gas if we use it as acooking fuel,they are as follows. :1)It is not hygienic that is it creates so much of dirt around it.2)Proper attention to fire and furnace is very necessary all thetime while cooking food.3)Gases generated from pot creates so much of heat. 4 View Full Answer Vidhi Patidar answered this It is harmful -2 Karan Wadhwa answered this just because it contains methane and carbon monoxide which is harmful 11 Chetan answered this true -2