Emotional and physical stress both contribute significantly to vocal distress. Using your major muscle groups in jogging, etc. is an excellent way to diminish stress. Eat a balanced diet. One may note hoarseness in the larynx or dryness of the throat after drinking significant amounts of alcohol, caffienated, as well naturally or artificially sweetened beverages. The body needs water to metabolize these foods and beverages, excessive consumption of these items will reduce the amount of water available to hydrate the voice.
Moisture is a necessary lubricant of the vocal folds.
When one's body is dehydrated laryngeal lubrication diminishes and wear takes place at a much greater rate than normal. Avoid dry, artificial interior climates. Avoid smoking cigarettes, cigars, pipes. These are bad for the heart, lungs, and vocal tract of not only yourself, but others around you as well. Avoid other irritant inhalants, i.e., marijuana.