"Rebreathing" for lack of a better term

We've been using a Volcano vaporizer since March. We noticed that lots of vapor was still in each hit we exhaled so we started exhaling into the bag and repeating that several times with each bag filling. It's just the two of us.

I'd love to hear about the health effects of this practice, whether it'll get you higher (seems to) and whether it's practiced by others.

Well, there is the fact that we breathe in O2 and breathe out CO2. A couple of rebreathings likely won't hurt you, but each breath removes some O2. Oxygen starvation can seem like being stoned. I'd limit the number of "hits" on a bag, to err on the side of caution. - Granny:hippy:.