Me and my friends have the urge to make an awesome smoke bomb, only problem is is that the materials we are given could present a problem. Heres the deal. The smoke bomb we want to make consists of 4 parts sugar, 6 parts potassium Nitrate. The only potassium nitrate we could get our hands on was that in fireworks. Now I read these fireworks have sulfur in them. If we were to make this smokebomb with the materials at hand, would the sulfur pose a health problem or change the composition into something very dangerous?