It's fun to blow smoke rings and as suggested you want to smoke a cigar that is densely packed so that you can get a big volume of smoke. Easiest way I know how to do this is to hold the smoke for a few seconds....open your mouth and make a circle with your lips....use your tongue to gently push some smoke out as you'll find a rhythm that makes the best ring. Start slow and then find that motion that gives you the best ring and after that you can use your lips to help like a fish does when you catch one. I've gotten so good at it that I can make a big smoke ring and then push a smaller ring inside of it and only do that when I feel like showing off. If only they would throw money when I do that!