I’d love to hear if it actually works! What triggers one uses to put someone in a hypnotic trance…? Things like snapping one’s finger makes for an interesting sci-fi story but isn’t practical at all.
It doesn't work like that at all. Hypnosis can't force you do something you don't want to do. You can be put into a hypnotic state, but you are still aware and can take control back at any point.
Hypnosis works best if it's something you agree with to begin with. For example: If you want to say quit smoking it can help because it's something you want to do.