When you play basketball (or other sports), it's easy to get dehydrated. Therefore, many athletes chew gum to keep their mouths moist during the games.
yes he can because it is healthy
85% of MLB Players chew.
Many football players chew before a game to reduce stress and calm them down for the upcoming game.
yes they do
Yes he does. You can often see the outline of a can of chew in his back pocket during games. Here's a picture.... i2.photobucket.com/albums/y50/Arize/IMAG0024.jpg
Yes, at the Major League level they can.