"What disease is ayahuasca fighting off? And specifically what is the the clinical benefit of the vomit stage?" I have heard people describe ayahuasca purging

"What disease is ayahuasca fighting off? And specifically what is the the clinical benefit of the vomit stage?" I have heard people describe ayahuasca purging as getting rid of mental and/or physical toxins... as getting rid of depression, emotional/psychological baggage, medical maladies, etc..