even if there was 1000+ mg of pure THC per slice, I’m still not worried cause it is impossible to overdose

See, this is the conventional wisdom but I'm skeptical given we've hit a similar point with capsaicin where after a few years of arms race to make the hottest peppers in the world and making peppers hotter by orders of magnitude from what previously occured in nature we now have a couple of individuals who have died as a result of eating extremely spicy food (granted it exposed underlying health conditions but they would very likely still be alive today if they hadn't eaten overly spicy food) so now there's some question to the conventional wisdom of spicy food can't kill you. And I seriously suspect that we'll see the same with THC sooner or later