Welcome to the nexus friend
Sorry I can't say I've had the pleasure of trying it through an ecig. I like the changa, a good bong rip can have the same effect and lasts longer for me, if its free base then it gets vaped in the gvg.
I prefer my eyes closed, even though sometimes it doesn't matter whether they are open or closed. I have taken a couple hits before, not enough to breakthrough, and kept my eyes open and stared at myself in a mirror, that was pretty strange
Peace