This is the 3rd time i try to capture smoke, and I think is the most successful one.
#1 - Original before colouring with Photoshop
#3 - Trying something new, a white background, turn out to be quite nice
Some of the equipments required:
Dark Background (in this case i use my diffuser)
This is how the setup look like
The thing you need to becareful is airflow, too much airflow will cause the smoke to be very weak, and too little airflow will make the smoke looks boring, not much movement.