Animated smoke can be done, but (1) you have pre-plan like crazy and (2) expect to spend a whack of time in rendering. What you have to do is consider first how smoke moves and evaporates. It rises, increases in size, then slowly disappears as its size reduces down. What that means is that you have to build a series of primitives and then morph their size and position through time. For example, I built an animation in which a curtain changed textures behind a sudden explosion of smoke. I needed approximately 8 spheres to make it work and set them to rise, grow, then reduce and subsequently disappear in a staggered array. (Ill post some images later tonight to demonstrate what I mean.) All eight transformed over roughly a five-second span, and at 15 fps, it took almost two days for the frames to render, but the result was amazingly lifelike. The same can be used to create cigarette smokw; you could even set it up to be a running loop if you build it correctly, meaning whatever you start with is duplicated in the construction at the end. When the first set of smoke images is gone, the second will be in motion, and when you loop the resulting movie, youll have the appearance of a continuous line of smoke. Again, it is slow and tedious and you really have to plan it out, but it can work with amazing results when done. Look for the images later this evening.