Vomiting won't get them out. If when you vomit you're bringing up matter from where they live then you've got much bigger problems than just a worms infection.

This is field survival manual, meant as a last resort for situations when you’re miles from civilization and neither a pharmacy nor a medic are available.

Of course there are better options out there.

Capsasian tickles on the other end when it is done.

Little bonus.

Btw for the capsaicin thing. It's one of the going theories for why warmer places all around earth tend to traditionally eat much spicier foods than colder places. Food spoils faster in the heat, and the spice both masks the spoilt taste and can help, or is thought to help, cleanse you of parasites.

(I know spicy plants don't grow in colder places, too, but the tendency holds for colder regions that would have had access to hot plants)