12 Cigars a Day and Whiskey and Coke
Here you go, another outlier that makes the case for doing whatever you enjoy. Still, if you're a tennis player I'd stay away from the smokes.
Pollution Kills
You can help to reduce your risk by exercise but living in an area where the air and water is bad and even your showers expose you to toxins will put you at risk.
Try to mitigate your risk by living to reduce exposures by choosing food, water, and air intake that will limit your risk.
How:
Stay out of smoky bars and living in places where you can see the air.
Filter your water and I'm not talking just some little sink-top device. Here is the best way that I know of and yes it takes work but unless you want to put in a very expensive reverse osmosis system with charcoal filtration and chlorine filters you can bypass many dollars spent.
Air filtration is another problem. If where you live brings you on constant contact with polluted air then it will impact your health. This is a personal choice.
Exercise helps mitigate many problems associated with the environment so keep with your tennis regimen.