You can use a camping stove inside as long as it is properly vented. You should not use propane or any other gas or liquid fuel stove inside because there is typically no way to vent the fumes that result from the burning of the fuel. Many people die each year from using a gas stove inside a tent because of poisoning from carbon monoxide, a tasteless, odorless, invisible gas. If you plan to use a stove inside a tent, a wood-burning stove with a flue pipe that directs smoke and gas directly out of the tent is recommended.