Can a person eat too many craisins?

Since i discovered craisins about 2 months ago, i have been hooked. I am up to 2-10 oz. bags per day. I eat a bowl of raisin bran for beakfast and something light and healthy for dinner. My pain meds make me terribly constipated so the digestive help is a blessing, but can i eat too many? Can they be bad in high quantities?