The answer is yes, you can. Hypnosis is mainly getting a person to focus on what you want them to, without them thinking about anything else. Just as you are reading this article. It takes communication patterns and skills to achieve these hypnotic effects. You need to know how to write hypnotic words, phrases, questions and sentences to receive your desired results.
People buy on emotions.
Just imagine using the hypnotic words and phrases above to write a new sales letter or to improve an existing one. Visualize writing hypnotic headlines, openings, bullets, guarantees, closings, p.s's, etc.