a later type of napalm, napalm-b, also called "super napalm", has low-octane gasoline, benzene and polystyrene in it. it was used in the vietnam war. napalm b burns for up to 10 minutes with fewer fireballs. this is different conventional napalm, which burns for only 15–30 seconds. it also sticks better to surfaces, and can destroy things better. it is not as easy to light on fire. this lowers the number of accidents caused by soldiers smoking. it gives a unique smell when it burns.