Yes, higher potency marijuana is more dangerous, because the person is taking higher and higher doses of the drug. It would be no different than a person taking a higher dose of any other drug that is prescribed. It will have a higher effect. Marijuana has effects and side effects, and they should be taken seriously.
I have thought about it, Marijuana even with a higher potency cannot cause any overdoses, due to its intake, and the high wall to actually overdose. But, on the other hand Marijuana at a higher potency will cause people to be come more high, leading them to actually make more potential accidents and bad decisions. This is what would in fact make it technically more dangerous.