They are very intelligent. Smoking cessation is a popular treatment with acupuncture. It usually involves acupoints on the ear. Many believe that this increases the efficacy of the treatment. Depending on the practitioner, and the patient's unique needs, there may be some other needles placed elsewhere on the body as well.
Treatments vary widely.
Some advertise that only one treatment is needed. I've heard of this working, though I think that the patients that respond to only one treatment are few and far between, but that's just my opinion. I believe that acupuncture is a wonderful therapy that will assist the patient in breaking the addiction with a minimum of withdrawal and an enormous amount of much needed support. Acupuncture does not quit smoking for you. You have to want it.