The only way of finding the limits of the possible is by going beyond them into the impossible - Arthur C. Clarke
There are a large number of smoking cessation aids on the market and to answer the question of how they work you first have to explain how smoking addiction works. Once you understand this you will better understand how smoking cessation aids work.
The human brain produces a hormone which gives all of us good feelings, contentment, and helps us with depression. When we feel stress the brain interpreted this as a need for a boost of good feeling and the hormone system produces this chemical. When you start smoking nicotine produces the exact same feelings produced by the natural chemical. Over a period of time, as you artificially produce these feelings the brain sees this as an indication that the chemical is need less and less, and eventually as your smoking increases, not 
at all. So now your body has a reliance on this feeling that it can only get from cigarettes. When you suddenly withdrawal this artificial chemical the brain is either not producing the necessary chemical or producing very little. It takes time for the brain to increase production to its previous levels. Smoking cessation aids work by assisting the body in getting the stimulus it needs from other sources. Some introduce pure nicotine into the system either orally or trans-dermal to allow you to break the mental habit and slowly reduce you dependence on nicotine.
Since when you smoke you actually have both a physical and psychological habit smoking cessation aids help you break one habit at a time. Some people actually use more than one method at a time and this is also proving very effective. Most of the successful stop smoking programs come with extensive counseling and support and this is very necessary for many people. Just like quitting a drug or alcohol quitting smoking is much easier if you can share your experiences with people who share your burden.
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