Actually I happen to have had a friend who decided that he was going to light a cigarette in the midst of blowing butane hash oil.
Let's just say that not only did you blow up the house but he also caused a fireball that melted his girlfriend's pants. The microfiber pants that she was wearing caught fire and stuck to her legs. Causing massive Burns.
Another friend of mine was doing it outside and the fuel-air explosion damaged his hearing as well as burned him pretty good.