A 'sign of the times' shot which has been published once.

It was taken almost by accident. A planned portrait session was
progressing when the girl decided that she wanted a cigarette. We
had a break, but it occurred to me that the flash backlight that
I had been using would also light up the smoke well. 

The black background was also going to be a great help.

So, without any changes in set up, a few shots were taken.