All magic is smoke and mirrors to an extent, but that doesn't stop us from being amazed when a magician is able to seemingly produce smoke and fire from their fingertips. It's a trick that can be used to put emphasis on a really impressive card trick.
There's no great mystery to this - but it is dangerous. All you need is a tiny amount of phosphorous on your fingers, which you rub together to create the smoke. Phosphorous can easily begin to burn, though, so using the smallest amount possible is crucial!