Anyone of normal or higher intelligence can be hypnotized.
Even young or learning disabled children who are able to listen to a story being told are receptive to Hypnosis.
Most people are in a state of hypnosis several times a day. When you are daydreaming or lose track of time when you are o a long drive,reading a good book, watching a good movie or your favorite sports team, playing video games, if you hear a song that takes you back to another time or place you are in a hypnotic state!
This "altered state" between waking and sleeping is a perfectly natural state we all go through as we begin to drift off to sleep or when we are extremely relaxed. It is not the "hypnotic state" but the suggestions and instructions which are placed into the subconscious mind while the subject is in a relaxed state of mind that enables and accomplishes change in habits or behaviors.
Contrary to most beliefs, it is not necessary to be in a deep state of hypnosis in order to accomplish positive results. In fact, hypnotherapy is quite different from the "stage hypnosis" that most people may be familiar with where people do things that are silly or embarrassing. Your hypnotist does not have "control of your mind" and you will not do anything that you would not choose to do on a conscious level.