Thinking about the clearly visible smoke of the Helicopter wreckages we should consider using smoke as a signal, or on the hand trying to avoid making us detectable by a smoking fire. One will think twice and approach more carefully if u see smoke then. It could be someone roasting a deer, not the UH-1Y-Venom where you just wanted to get your brand new M4 with ammo n stuff.

Making smoke signals would be quite easy, just put a wet piece of cloth on the fire, throw some leaves on it or soaked firewood. Doing so, you would also have to check if you got really dry wood to get yourself warm without smoking out all of Elektro. But! you may want to smoke someone out of a building. Start a smoking fire in the basement and force the occupants to leave or they will suffer from smoke intoxication and even die. The usage of fuel to start a fire should be implemented soon and easily, just to finish this thought.