Which of the following is NOT an incendiary device?

A smoke grenade is not classified as an incendiary device because its primary function is to produce smoke for signaling or screening purposes rather than to ignite or cause a fire intentionally. While smoke grenades contain pyrotechnic materials that generate smoke, they are designed for a specific application in military or tactical situations and generally do not produce flames or heat that would result in combustion.

In contrast, incendiary devices like Molotov cocktails, fireworks, and incendiary bombs are designed specifically to start fires or cause explosions. Molotov cocktails are improvised incendiary weapons filled with flammable liquid. Fireworks utilize explosive materials that can create fires upon detonation, while incendiary bombs are designed to cause fires on impact with their flammable content. Therefore, understanding the core purpose and design of these devices is crucial in distinguishing between incendiary devices and others like smoke grenades.