Lots of people in China smoke, and lots of people in China travel by airplane.
Consequently, lots of lighters get confiscated in Chinese airport security controls.
But instead of trashing the lighters, the airport authorities in Shanghai are reusing them, simply by offering them to arriving passengers free of charge. Confiscated lighters are placed in repositories on the other side of Customs for anyone to take when leaving the airport.
It is a simple initiative that works on several levels: It is good for the environment (albeit on a small scale), it is a free service, and it generates a sense of connectivity between random travelers.
Picture taken at Pudong Airport