I live in the Netherlands where there is a "coffeeshop" culture, with some of these coffeeshops having a connaisseur-like focus - as in, they sometimes even offer extremely exotic strains that you've never heard about and aren't even on Leafly etc yet, sourced from god knows where 10000 miles away, and then carefully and passionately grown and cured - and I can 100% guarantee you that people are not necessarily getting sick from more potent strains or over-the-top breeding as a direct correlation to potency. With good potent strains, cleanly grown, you simply naturally smoke less while still enjoying the strains unique effect and flavour profiles.
Are there people who get sick from being stupid and smoking half a dozen pure blunts in a row? For sure. I once almost hit two totally greened out Asian tourists who were vomiting onto the bicycle path in Amsterdam, and I've seen people just blacking out for a few seconds in the coffeeshops after smoking one blunt after another for hours on end. Teens in their endless, hormone-guided stupidity are probably getting sick from time to time too, and the higher potency very likely does not help, neither does having zero tolerance and not being advised about the strength at hand.
However, I definitely beg to differ, and to not conclude that potency equals sickness. Stupidity or naivety does, and potency is definitely not a "public health risk". You probably wouldn't call Scotch a public health risk either simply for it being stronger than beer. The user determines the risk, education and controlled dispensing help mitigate it and even the most insane ultra-potent strain will not kill you, only deliver you a 1-2 hour lesson in personal responsibility.
I don't smoke much any more, but I still like to visit every new coffeeshop I see and haven't been at before, so I have probably seen and smoked over a hundred different strains by now. They all have more or less different effects, flavours, potential medical applications, benefits and disadvantages, but exactly nil of them have/had a "making sick" property by default. In fact, with most of them, you only have to inhale one or two puffs to immediately notice how and how strongly they will affect you, and the only way to ever get sick is by ignoring common sense and forcing it.
IF there is weed you can actually get dangerously sick from these days, it is unregulated and adulterated street weed, which is absolutely flooding Europe these days and people are consistently dying left and right from smoking it, but even that has nothing to do with the weed itself.