Nox_UK is correct about the smoke thing. The last step in manufacturing electronic components is the injection of smoke.
The smoke serves two purposes.
First it is what makes all electronics work.
This was discovered by Thomas Edison in the late 1890's while he was inventing the light-bulb. Just about any smoke would work so Edison took up smoking a pipe.
He would puff a little smoke into every bulb he made. One of his original light bulbs is still burning today.
Later during the 1950's, IBM discovered that the quality of the smoke had a direct bearing on the function of components as they got smaller.
Secondly, the smoke acts as an indicator when a device has reached the end of its useful life.
The device will rupture and allow the smoke to escape. This keeps the limited amount of high quality smoke available for use in new components.
It's a little known fact that Japan has the best smoke. Their smoke capture is arguably the best in the world. Additionally, they have found a way to concentrate the smoke which allows for smaller components. This is the reason that Japanese electronics are considered the best.
So the next time you smoke an electronic device just remember that you are helping complete the circle of smoke.