What are the chances i get cancer from chewing?

me and my friend have been chewin consistently copenhagen long cut for about a year and 1/2. I take about 6 chews a day and he takes probably 4 or so. My question is what is the statistics of us getting any disease from chewing. even though we both brush twice a day floss and my friend uses mouth wash. Id really appreciate if you could help us. we both rodeo and have never heard of anyone getting cancer but are still worried that it could happen to us.