hi! sorry to bother, but you were the first (helpful) result when i googled "john dies at the end trigger warnings." do you recall if there's overdose? like, someone almost dies/does die of overdose
Oh nice, I'm glad that old list is getting some use!! So like, I'm wracking my brain and i don't think i remember that happening. The weird otherworldly drug does kill people, but not by overdose, it sorta leads them to die in other ways. When John takes the otherworldly drug at one point, Dave (who's the main first person pov guy) doesn't realize it's a supernatural situation, and i don't remember if he specifically thinks it's an OD but he does want to take John to a hospital, and John is very non-responsive for a bit (not unconscious but not replying or seeming to respond to most things). It's possible that some random person is like, mentioned as having ODed, just like casually mention someone as a throwaway thing, it wouldn't be tonally out of place, but it also is possible that doesn't happen, I'm just saying that's a possibility. I don't recall any characters who appear as characters who like talk to anyone as ODing.
This is all irt the first book, and also the movie. The second book I'm less positive on, but still don't recall an OD.
I should also warn that the tw/cw list only includes the first two books and the movie, and doesn't include anything from the third or fourth book. I did read the third book but not the fourth, and there's at least one big thing that the third book adds to the list (character implying he assaulted a child, though the narration does make it clear as the character is saying this that he's almost certainly lying with the purpose of upsetting the child's father), but it's been a while, I'm least familiar with the third book, and i did not read the fourth. The third one involves heavier use of regular degular drugs by someone, the type that can be ODed on, though he doesn't.
Oh, and there's def alcohol use, at one point in the second book a character does spend an extended period of in-universe time heavily drunk, but i don't recall him coming close to death from it.
Sorry i can't be more certain about this. I'm gonna go ahead and publish this in the tags, because i know there's a lot of people who can correct me if I'm missing something, and i very well could be, even something obvious (memory is weird & drug ODs aren't something I'm personally sensitive to so it could easily just not really register for me) so i suggest checking the notes at some point to see if anyone else has responded. Though also, if you'd rather your url not be attached to this post, shoot me another message and I'll delete this and make a separate post asking the same thing.
Hope this and any further responses are helpful!