Numbing the throat with one of these sprays is an especially bad idea if you are about to perform or sing. Performing under the influence of one of these has been likened to playing the piano with gloves on. Work Environment Avoid smoke filled and dusty environments. Traveling to dry environments such as Las Vegas or Phoenix may also cause voice problems. It is best to keep a humidifier on at night, and to maintain good water intake.
Airplanes are also notoriously dry environments.
If you are traveling by plane a significant amount, you should increase your water intake accordingly.