The first thing I would look in to is to find out if the vapors given off by the burning of such salts are safe to be inhaled. Remember, safety first.
As far as if it will disrupt the effects of the spell, it might. You would need to know what chemicals are being released. Then you can look up the qualities of the chemicals and see if they are in harmony with the effect you are trying to accomplish. If you are trying to do something, for example, to bring peace to a relationship but you bring in a corrosive material to change the color flame, or you produce one by burning the material, then that might not be bad.
Anything could have an effect on the outcome of your work. Do your research.