I get the sense you haven't yet done much research on the method. See the SN Resources thread that's linked in the Resource Compilation, you'll see links to SN success and failures. If you do the method right, even if you vomit, you will succeed if you're not interrupted. Some people vomit even with meto. Also see Stan's guide. Meto is nice to have but is not an outright requirement in any guide.
I'm sure there will be arguments to what I've stated, or examples of anecdotal accounts like the totally out there one where the guy vomited, still wasn't dead after seven hours, and was banned not long after posting for having an alt account. Don't take my word for any of this, I've done my work researching the method, carefully reading and analyzing every resource, paying attention to anecdotal accounts, and having conversations about all of this on the forum, and I came to what I consider is an informed opinion such that I would be confident to attempt without meto. But you have to do that for yourself, and you might not end up agreeing with me and that's fine, your life depends on your own opinion, not mine.