“White Rabbit, White Rabbit, White Rabbit” is an expression used when people are sitting around a campfire. It is used to get the smoke out of one’s face and by repeating these words, the smoke will change direction. The concept is that the smoke is made up of hundreds of minuscule white rabbits. They only go in your face because they don’t feel appreciated and want attention. By saying white rabbit three times, you acknowledge their presence and therefore, will leave you alone.
The informant learned this folk expression through Boy Scouts. It is exactly the type of silly thing that would be made up by kids. The informant heard it from an older scout while away at camp. They still practice it to this day because it shows a fun, non-serious side.
It seems to me that it is a childish solution presented for a childish problem. Many kids enjoy camping or at least are forced to participate in it. Kids are very focused on the moment, so something like smoke in their face would upset them greatly. This “solution” turns this problem into a fun game that holds, in theory, real-world significance.