Kratom is about as addictive as coffee. Won't die without coffee, won't die without kratom. I've found that by taking much less than the "recommended" dosages (no more than 3-4 capsules throughout the day), withdrawal symptoms are almost nil. Of course that depends on the potency of the strain used, good rule of thumb though.
Used it initially as a painkiller and an energy booster, found that it killed nicotine cravings as well.