I've somehow developed a strange habit. I'll mouth hit and inhale but then I start another mouth hit while I'm exhaling out my nose. I'll do this for like 4-5 hits in a row! Nothing stealthy about it at all.
same here, my girlfriend calls me a dragon when I do.
I also have sinus problems and have always had really bad nose bleeds but I haven't had a problem with the vapor irritating it.