I know, this is a stupid thread. I was wondering you you exhale into a plastic bag through a straw, and inhale it back will you get higher?
Nope. THC is absorbed after about 2 seconds ( I believe, correct me if im wrong) so doing that is a waste of time.
Most people hold the smoke for about 2-3 seconds, some say as much as 5 is okay but few would go over that. The THC is absorbed quickly and after that you are just depriving yourself of oxygen. Breathing back exhaled air will do nothing but give you hypoxia. No need to delete if you don't want. Someone else may benefit from this post. Peace.