How to get this photoshop image on a transparent background?

[greenLight]

I've been following this tutorial here: https://www.youtube.com/watch?v=xlqEgl1KP2M and I managed to get a nice final result but I would like to have this on a transparent background instead of black.
I have also tried to work on a transparent layer in the first place and make an additional black layer so I can remove it in the end but the result was not the expected one.

I have attached my .psd file below.

 

[bbq_bob]

Did you still want the black in the smoke, or should it be transparent too? If it is the latter, is this what you want?

I did this by turning off the red and blue color layer. This made white smoke over a black background. I stamped visible, and then used that as a mask to the red & blue color layer. You may need to bump the brightness of the mask to get the color back as vivid as the original.

I'm sure the experts have a better way. I'm new at this too.