Taking the pictures

• Use a joss stick: there's plenty of smoke and it lasts a while. When the room gets smokey, open the windows to get rid of the smoke, which will increase contrast in your pictures.
• I use a telephoto; it minimises the size of the backdrop needed.
• Make sure the backdrop is black.
• Use a flash camera left or right, and use a snoot to ensure the flash doesn't fall on the lens / backdrop. I used 2 cereal boxes to block the light
• Use a desk lamp to light the smoke for autofocus.
• Recommended camera settings to start: ISO 100/200, shutter speed 1/250, aperture f/8.
• Don't use a tripod; the patterns in the smoke will move and a tripod will hinder you.
  • Alternatively, if you do use a tripod, just autofocus on the tip of the joss stick, switch to manual focus and crop the pictures later.

Post Processing

• Use levels to make the background is completely black.
• Use the healing brush tool to remove any stubborn non-black areas in the background.
• Use a black brush to trim any unwanted areas of smoke.
• Load a channel as selection (try all of them to see what's best)
  • Create a new layer from the selection, then fill white. After that you can paint colours or use a gradient

Links that i found useful:

• http://sensitivelight.com/photographingsmoke/
• http://vimeo.com/4698985

P.S. I'm no expert, but the above seems to get decent pics: