Try Altoids or Altoid gum. It packs alot more punch than ordinary gum.
I tried gum in the beginning of my quit but it had not enough kick. I'd rather chew on hot peppers and often do. Cinnamon sticks (as suggested by Amy) are a great substitute.
Personally, I've started nibbling on beef jerky and pemican - the spiciest ones I can find. These are low fat and nutritious. It's a little pricey and can wind up costing almost as much as cigarets, but far more healthy.
As I've often said, if I could quit using NRT, I'd never worry about stopping the patch or gum. Even though nicotine is not a very healthy substance, it is NOT smoking. Having said that, it is, of course, much better to be rid of the nicotine entirely. My point is that you are LEARNING not to smoke and UNLEARNING alot of smoking rituals and habits. If the NRT is helping you to stay quit, don't feel that you MUST be in a huge rush to get off it. It is MUCH easier to get off the nicogum than it is to break the smoking addiction.
I have been quit for 2 Months, 2 Days, 6 hours, 8 minutes and 13 seconds (63 days). I have saved $354.22 by not smoking 1,012 cigarettes. I have saved 3 Days, 12 hours and 20 minutes of my life.
...... Smoked for over 45 years - not any more
"IF I HAVE JUST ONE, I'LL BE BACK WHERE I STARTED.
WHERE I STARTED WAS DESPERATELY WISHING I WAS WHERE I AM TODAY" Author Unknown