Halotherapy is 100% safe, natural and drug-free. Normally, there are no aftereffects. Some people experience production of mucus or a throat tickle. Sipping water can relieve this. A runny nose or cough is the body's natural way of eliminating toxins, pollens and viruses. Smokers may experience an agitated cough and excess mucus. Heavy smokers are discouraged in the use of halotherapy due to extreme agitated coughing.