Just so we know exactly what we are talking about, we should try to define the terminology first.
Drug is, I believe a Germanic root and it originally meant "dry plant matter" with the implication beng that the dried plants are going to be used as medicine.
And that makes sense. Even Methamphetamine is semi-synthetic when you get to the brass tacks of it, being made originally from Ephedrine, itself a constituent of a shrub know as Ephedra Sinica. Crac Cocaine begins its life as a Coca Shrub. Morphine is found in the latex of the poppy and the vast majority of Opioids are created with Morphine as a starting point.
I think what OP is trying to ask, is is Kratom a drug of addiction. Is it a drug that a person can become addicted to, dependent upon and/or use compulsively.
The answer to that question is yes.
Like Morphine in Opium, Kratom's effects are moderated by the drug Mitragynine and its analogs like 7-Hydrxymitragynine etc.
Kratom is relatively new in terms of our knowledge, though it seems that Mitragynine is am Opioid agonist. I generally tell people to think of it as being along the lines of Codeine and this seems to jive pretty well.
As an Opioid, yes addiction, dependence and compulsive use can and do happen.
It us not in the same realm as stuff like Valerian, Lemon Balm, Theanine and so on.
Another interesting outlier in the world of herbs would be Kava. Kava is potent enough that alcoholics call it a reasonable substitute for Alcohol, though not as strong. Furthermore, it seems like Kava doesn't seem to cause compulsive usage for whatever reason.