I know that feeling of not being able to visualize the "end of the universe".
For myself, I have always experienced the Breathing of the Universal Energy as steam rather than smoke. I have tried to make it smoke. However, I have a definite heat - cool cycle as I breath. It always made stronger when I see the unnecessary energy as steam.
Currently, I see the steam leaving my body and I trust that it will find its way to the rightfull place at the end of the universe, without my watching it. I find that the trying to watch it all the way out, reduces my sensation of it leaving. So I focus on the in with the good (better vibrational energy) and out with the bad (wrong type, in the wrong place, in the wrong amount). (There is no good or bad just not the appropriate energy for a certain purpose).
ooops, started to ramble again.
You are perfection,
Iam2 