Results are variable, depends on counseling frequency or health condition of subject. Nicotine Gum is hard on the Stomach, Nicotine Patch hard on the skin, the Inhaler is hard on the throat and lungs.
Many methods require that the smoker keep dwelling on the cessation program.
That makes the quitting even more difficult. It is user-friendly especially if the motivation to quit is there. The core success rate is the 'cold turkey' method. If the contra-indications and medical conditions is evaluated, none of the nicotine delivery systems can be considered as safe. If there are other smokers in the household, quitting together is desirable.