A great idea came to me the other day, quite literally in a flash. I was at a kids birthday party (well, I don't get out much) and the kids had indoor sparklers. Jolly fun and cheap as chips. Mrs Pitts was just about to throw out the left over sparkler sticks when I realised they were just perfect for smoke trails for damaged aircraft. Just snip off the excess wire, twist the end into a hook and they fit beautifully on 1/600th aircraft. Don't believe me? See the pics. You could even get away without painting them but they are a tad brittle so a PVA coating will firm them up and a white drybrush highlights them to perfection.
Just one pack of sparklers gives enough smoke trails for most games and the fact that you are throwing hardly anything away means less landfill and saves the planet. Hurrah.
PS: Don't snatch sparklers away from your kids until they've gone out. It really upsets them.