We need to change our minds at the core. Unless we change it right down to the root, no matter what we do on a surface level, we will always revert to the same old familiar pattern of behaviour- Frustrating !!
Smoking in this day and age is a maladaptive behaviour, helping those that smoke survive and cope on one level or another.
It may be to deal with stress or anxiety, fit in socially, break from a stressful job, bond with a new partner whom smokes, soothe emotions, deal with crises and so on. This maladaptive way to survive in the world may often be rationalised and even defended in the face of opposition.
Hypnotherapy can help to identify the irrational and unconscious reasons and compulsions to smoke, as well as the blocks to being a non-smoker.