Here are some sugar free solutions for you:
1. Fresh juices
2. Mineral water
3. Apples
4. Bananas
5. Dry roasted peanuts
6. Carrots
7. Low fat or un-sweetened yogurt
The trick is to eat at frequent intervals but with small servings. Eat slowly and try to be the last one to finish meals. Eating slow will help digest food properly. If the craving for food is just the substitution for smoke or kill the time, instead take a walk outside in nature, take a shower, water the plants, listen to music which will relax your restlessness. Eat mint, mouth fresheners, roasted corn, or piece of coconut, etc and such foods which take time to chew to kill that minute of craving not only for smoke but for fattening food items too.