1. Make a video clip, draw a chimney, and put it on the stage.
2. Make another video clip, draw an ellipse, insert a keyframe at frame 15, enlarge the ellipse, change the transparency to 0, and create a tween shape. Select these 15 frames, copy the frames, create a new layer, offset 5 frames, insert blank keyframes, and paste the frames. In this way, make the other three layers.
3. Place this video clip at the chimney mouth (also on the stage) and name it smoke_mc. Write on the chimney
on(press){ _root.smoke_mc.play();
}