From what I understand, or so I thought, when vapor is released into the air it wants to disperse evenly. It wants to spread out evenly in a "puff" and rise quickly. Smoke likes to stay together and flow more "snake like" in the air. You could also describe it as a genie coming out of a lamp, I guess. Now lately, I have been seeing what appears to be flowing like smoke, but each time I check inside everything is still a fresh green color. I am confused because it appears to be smoke, but nothing is burned. Often times there is no major color change, let alone black. I've never seen a true black before. Can vapor be "snake like" too if it's thick enough? I must be missing something here. Science lessons are welcome (I like science).