before I can tell you anything Do you know if You swallow Bubble Gum or Chewing Gum, cause umm there is a difference, bubble gum actually contains plastic to make it more stretchy ( to blow bubbles duh ) and chewing gum... well self explanatory, now there are consequences for both although chewing gum I guess you could swallow it. It wont kill you, unless you swallow like a whole bunch then it can harm you. Now bubble gum... well it contains plastic, your not supposed to swallow plastic so yeah it would be pretty bad...
ok ya know just take a look at this link
http://www.kidshealth.org/teen/question/
dieting/swallow_gum.html