Those are deadly.
My dirah as a bochur had a sign which said
סגולה גדולה לכאבי הבטן לאכול
נ נק נקנ נקני נקניק מן הצומח
ALOL
1. It's been many years since. They might have improved.
2. If they weren't so popular, no sign was needed.
3. Back then it was qualified מן הצומח. In recent years I've head it referred to (and sold in fast food places) without a qualifier.
4. TBH that segulah applies also to the Fleishig variety. I haven't eaten salami for more than 30 years, and hotdogs are more recent, but I don't eat those either for the last several years.