I with you there brother. I used to smoke cigarettes a long while ago and could get the circular breathing type of smoking going. But when I started to read about snorking here I couldn't figure out how to do it without fully inhaling first.
Then last weekend my I was telling my nonsmoking wife (she dabbled in early university) about it. So she takes my cigar from me and, BAM, she does it. I tried to hide my shame, took the cigar back from her and then just did it.
Take a draw on you cigar, close your mouth and exhale through your nose. The air in your mouth (and the smoke) will go out with what is also in your lungs.
I found it kinda burned the back of my sinuses a bit, but if you try, you can let out smaller amounts.
Good luck with your efforts.