Many people in the world enjoy chewing gum for the refreshing taste, removal of breathe odour, and some even use it as a study aid for increased focus.
What many people don't know is that when they chew gum, they are also stimulating salivation and subsequent swallowing. Unfortunately, this means that more air is being swallowed than usual, which leads to increased (and perhaps minty-fresh) flatulence. Ever noticed a correlation? You may well do after reading this.
On top of that, chewing gum's taste is usually from mint, a natural herb that's known to aid the digestive process, which in turn leads to an increase in wind expulsion.
Another factor comes into play when chewing sugar-free gum, because most of them contain sweeteners, like sorbitol or xylitol, which are also known to cause gas.