Smoking is the silent killer of the 20th century more people died from smoking and smoking related illness in the past hundred years than in all the major wars. The situation used to be one of ignorance people did not realise the ill-effects of their habit on their health and the health of those around them. Today the situation has changed most realise the danger but many are addicted and find it extremely difficult to quit. Nicotine is a drug and like most is highly addictive it is a craving for this nicotine which makes it difficult to suddenly stop smoking, hence the introduction of nicotine replacement therapy. The release of nicotine or some similar substance delivers the nicotine to the body without the harmful tar of smoke inhalation hence relieving some of the craving intensity.…