The tricks with cannabis in this context are that (a) different strains have different effects, (b) different people react differently to cannabis and © different strains have different effects on different people. It’s impossible to OD on cannabis, and I’ve personally never seen or heard of anyone getting violent or abusive, and I’ve been around a lot of cannabis. Obnoxious, yes, and messy, but not harmful. Compare that to alcohol. Of course, the plural of anecdote is not data, so my personal experience isn’t the end all be all of facts; your own mileage may vary.
However, there is strong evidence that cannabis can exacerbate problems in people who are schizophrenic or have forms of clinical psychosis, so probably any cannabis is too much for someone like that. I’ve used strains that do something or the other to my brain chemistry that gives me insomnia - were I to use that strain again, it wouldn’t be prudent, and it probably wouldn’t be prudent for me to use cannabis if the guaranteed side effect was insomnia. But I’ve learned my lesson and now use strains that do not give my specific brain chemistry insomniac effects. One huge benefit of legalization is that the information on the strain is readily available and is very helpful in learning more about what is and isn’t optimal for an individual.
But if you are just using it, legally, to relax in the same way that you could with a beer or two, I don’t think anyone could argue that that’s ‘going too far’ in any context, at least medically.
As far as addiction goes, cannabis is more of a behavioral “addiction” than a physiological one. It can be a hoot to smoke a bowl and watch Netflix, but if you do that, all the time, at the expensive of being productive, working, spending time with your friends and family or other worthy pursuits THEN it goes too far. But that can be said of any behavior that eats up all your time and prevents you from living a full life.