Do you abuse your voice?

Don't abuse or misuse your voice. Avoid yelling or screaming, and try not to talk loudly in noisy areas. If your throat feels dry or tired, or your voice is getting hoarse, reduce your voice use. The hoarseness is a warning sign that your vocal cords are irritated.

Tips for a Healthy Voice

http://www.livescience.com/4078-10-tips-healthy-voice.html 

Some people spend hours at the gym or pounding the pavement to keep their bodies in shape. But beyond singers and actors, who worries much about their voices?

 1. Drink water to keep your body well hydrated, and avoid alcohol and caffeine. Your vocal cords vibrate very fast, and having a proper water balance helps keep them lubricated. Important note: Foods containing large amounts of water are excellent hydration-conscious snacks, including apples, pears, watermelon, peaches, melons, grapes, plums, bell peppers and applesauce.

Are you harming your vocal cords?  

 According to
Throat Clearing & Harsh Coughing
Throat clearing and harsh coughing are traumatic to the vocal cords and should be reduced as much as possible. One of the most frequent causes for throat clearing and coughing is thick mucus (due to dry vocal folds) or too much mucus (as with a cold) on or below the vocal folds. The safest and most efficient way to clear mucus is by using a gentle, breathy productive cough where there is high airflow with little sound. This can be achieved by using the following strategy: take in as deep a breath as possible, momentarily hold your breath, and produce a sharp, silent “H” sound while you expel the air.
http://www.texasvoicecenter.com/advice.html