Like everything in excess, not good. I experienced appetite increase, acne, gum recession, wanting to chew continuously. I was 5 to 7 pieces a day. If you chew one or two pieces every few days, that can be your 20%.
My Journal: http://www.marksdailyapple.com/forum/thread57916.html
When I let go of what I am, I become what I might be.