I would like to create a Text taht turns into smoke. While turning into Smoke, this Text should get invisible <- because it turns into smoke. Is it possible to creat this effect with particular?"
Anything is possible with the right approach, but your post sounds like you're expecting Particular to do all the work for you... Anyway, not too difficult. Put your text in a sub-comp and animate the dissolve whichever way you like, then use that comp as an layer emitter for Particular in another composition.