Why is there white smoke on the flash when the old camera flashes?

The one who smokes is a flash. In the past, old flashlights used magnesium as the filament. When magnesium is electrified, it is violently oxidized and burned in the air, producing strong light. The smoke you see is produced when magnesium is oxidized, so it is also called magnesium light. The light bulb of this lamp is disposable, and it needs to be replaced once it flashes. Modern flashlights can be used repeatedly by using the principle of high voltage discharge, and will not produce smoke when flashing.