“Sometimes many alternative treatments work solely on the basis of the power of suggestion or the placebo effect.”
So if I tell people it works via kishuf but really it’s just placebo, is that OK? Or is it geneivas da’as on my part? (Can I be oiver geneivas daas if I’m tricking people into not doing an aveirah? Are they doing an aveirah anyway if they think it’s kishuf but it isn’t?)