anyone who categorises passive vaping in the same way as smoking, doesn't have a brain to begin with.. seriously.. That's so idiotic, these individuals need to be ashamed of themselves.
However, the exploding battery bit, i do get. It's difficult to even buy batteries these days from OS.. They have to come up with a safe way of travelling for them.
That said, if it was really all that common, there'd be passenger flights all over the world going down with the millions of mobile phones in the sky travelling daily worldwide. So i'm a bit torn on this, but hey, we all do know of some instances where batteries explode.. phone and e cig alike.. so.. yeah.... more research needs to be done, and improvements made to batteries and their carrying safety in flight