In the summer we got asked for a light so many times whilst we walked the streets, that this year we decided to get our own lighters done. We are going for the middle one with "Jesus light of the world" made slightly bigger.
Should be a good discussion starter and personally I think a lot better than giving out tracts! or flyers.
We don't feel we our encouraging people to smoke, they want a light, they are going to get one somewhere, so we might as well give them one with a message!