OMG You guys are too funny!
I too spit when smoking a cigar, even if I'm enjoying a beverage as I do so. For me, it's because the secondhand smoke I inhale produces some phlegm from my lungs and that stuff really wants to come up. I smoke on the back patio, and there's plenty of plants that appreciate the extra moisture, so it's not a problem. However, when I get my own dream-cigar-lounge indoors, I may have to get a spittoon!