Joke
The magic smoke is observed to come out of electronic components when overheated, often through exposure to an extreme electrical current usually caused by the application of excess voltage through some failure of the circuit. According to the joke, at their factories, manufacturers put a little bit of magic smoke into every electronic component and it is this smoke which makes the device work. In support of this joke, once the magic smoke has been released, the device lacks its key component and no longer works. The smoke thus can be thought of as an essential part in the device's function. It is also noted that once let out, the magic smoke cannot be put back in.
In some variations of the joke, it is alleged that the major microchip production companies (especially the large microprocessor manufacturers) are involved in a conspiracy to keep the true nature of their products under wraps.
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