Any Human that is capable of focused attention, has experience a level of trance. If you have ever been lost in thought (Daydreamed) ,you have experienced a level of trance. To my knowledge , no rational mind can not be hypnotised. The level to which the trance can be brought to is the determining factor as to how effective / sustainable the suggestions will be retained. When done properly it can be a valuable tool. Sadly it is often used as a form of control for entertainment or to validate the need to be a controller, rather than a path to balanced understanding. Responcibility of caring/careful guidance the hypnotist provides, should be no less than that shown to a trusting child or blind person in a sighted world. Blessings