As a professional who needs their voice to be fit and healthy,  you need to be cautious about how you use voice in environments with loud background noise, such as clubs, airplanes, busy restaurants etc.  These environments can quickly lead to vocal fatigue and in some cases damage.

To help measure how you use your voice in these environments I recommend you wear one ear plug.  This help you project your voice without straining.  I know this seems weird and a little extreme.  But ask yourself, do you want to be an athlete or an Olympian?  You are getting paid to speak, so you have a duty to do all that you can to give your very best performance, every performance.