I’ve taken it for years with no issue except constipation from time to time. Kratom is about as impactful to me as an acetaminophen pill and a couple cups of coffee, which is good since I have to be careful about which substances I put into my body. I take one teaspoon infrequently. The key to taking it is to not take too much. Less=more, since higher dosages start having an inverse effect.
Articles like this one only seem to be creating hysteria where none should exist. We need more proper studies on the plant, but for now people should treat it like anything else: don’t overdo it. I mean, you wouldn’t take 15 acetaminophen tablets, and likewise you shouldn’t take dozens of grams of kratom at once.
Disclaimer: some people can’t keep their dosages low and they will develop a problem, so be careful with the stuff (or don’t even try it if you are worried about becoming addicted).