See .. if you let the smoke out, it doesn't work anymore Sometimes there are other components compressed inside too.. As you know the CHIP has "sizzle", but some things have "pop", or even "bang!", in various combinations. Other devices have "flash", or "flame", and the occasional piece of black plastic that is spring-loaded and aimed to "just miss your head" as it flies out at great speed. Other than the actual smoke that is inside, the other internal component that is common to all is "that electrical smell".
It is a mystery to me how they get all of that inside those little black cases!