We all have our weaknesses I guess. For me, nothing was harder to quit than pot. I've regularly used opiates, kratom, and even tobacco and I can pick them up and put them down with ease and lack of noticable side effects (short of a few depressed days). Weed took weeks of dealing with lack of sleep, agression and obsessive thoughts before I broke free, and that was after many failed attempts.
I have personally seen several friends kick regular pill habits with kratom and they got off it OK. We should discuss the downsides but from what I've seen the folks with kratom problems just took way too much(as addicts will do, I guess).