Transparent cigarette smoke

[handrawn]

Nice effect indeed Steve L - very effective

Rowby open up the xar file that contains the smoke brush together with the xar file that you are working on.
In your working file select the freehand tool [f3] and you should then be able to choose the smoke brush from the brush options.
Once you have used this, you can close the smoke brush file, and the brush will then remain in your working document.