Hypnotherapy is a controversial treatment modality for de addiction. There is conflicting evidence on its efficacy. During Hypnotherapy, highly suggestible subjects are eased into a trans like state, to influence their set patterns of thinking, or schema. Once changed, the person is snapped out of that state, and improvement observed. It is practiced rarely by Psychiatrists. You will certainly need to continue your medication. Having said that, as an adjunct treatment, anything that can get you to quit smoking is good. I wish you best of luck for quitting smoking and alcohol.