In answer to your question....
As many as one wants to!!!

I currently have four, but desperately guided myself away from the recent "Blem & Clearance" sale going on at ProVape. When I first saw it - I felt like a kid in a candy store (all the colors of the rainbow were available!) but I hesitated. Then kept going back day after day as the supply dwindled. At one point I think I actually put a SS in my cart, but didn't complete the purchase. Then finally today - all gone -

, but also a
sense of relief as the temptation wasn't there any longer

.
I need to clear out some of the other stuff that I no longer use, then I will probably
buy another ProV...when is enough enough.....uh never!?!?!