My vv reo stays shut off when I'm not using it. When they first came out, there were a few that had firing issues..mine was one of them (it's fixed now) but I'll never forget seeing it sitting beside me, firing on it's own! Besides, there's a red led on the inside that stays on unless it's switched off.
I usually turn my provari off when I put it in my purse. If I have one gripe about the provari, it's that it takes going through the menu to turn it off...so sometimes it goes in my purse without turning it off. I take my vv madvapes box to work because (besides it being small and easy to conceal) its simple to switch off.