As much as I dislike the quacks that sell 'alternative' medicines and theories based on no evidence and a pushy sales patter, they are nothing new.
Leanne McNamara published an article Conjurers, Purifiers, Vagabonds And Quacks? The Clinical Roles of the Folk and Hippocratic Healers of Classical Greece on them in Iris: Journal of the Classical Association of Victoria, Vol. 16-17 (2003-4) available as a PDF here. Highlights include ... oh too many to mention.