it's not uncommon for naive (first-time) consumers, especially of edibles, to have intense reactions that lead to ER visits; I suspect that many of those are just folks who have no idea what is going on and interpret the feeling as being dangerous. IIRC the symptoms often include racing heart, intense paranoia, and a general feeling of lack of control.

Also the ER is the first line of treatment for many individuals.

Most people wouldn’t visit an ER for cannabis unless they already had some anxiety disorder that lead to insane amounts of anxiety.

That's a strange thing to say, why do you think that? I know a lot of people who don't have anxiety disorders who had an anxiety attack when they first got high, and yes they might think they need to go to the hospital. The physical experience of weed can feel like you're dying

Most people know you can’t die from cannabis no matter what so in my experience they just sleep through it. I’m assuming people with anxiety disorders can’t rationally think through this scenario when they have taken too much and end up going to the ER.