While eating or ingesting too much salt can be bad for your body, breathing it in does not affect your heart, stomach or kidneys, as exposure during salt therapy is limited to your respiratory system. Even then, the concentration of pharmaceutical grade salt that you breathe in during salt therapy is very low (between .5 and 10 milligrams per cubic meter — less than a tea spoon). Because of salt’s natural anti bacterial, anti-inflammatory properties, and its ability to clear passageways and break down mucous, it has only healing affects when taken into the body this way.