You seem to be generalizing from fictional evidence, which is frowned upon here, and may explain the downvote (assuming people inferred the longer version from your initial question).
fictional evidence
I have heard of real drugs & poisons which induce vomiting at high doses and so make it hard to kill oneself; but unfortunately I can't seem to remember any cases. (Except for one attempt to commit suicide using modafinil, which gave the woman so severe a headache she couldn't swallow any more; and apparently LSD has such a high LD-50 that you can't even hurt yourself before getting high.)
ITT we talk about whatever.