Nicotine withrawal is a term used to describe when a person who is nicotine dependent suddenly stops or significantly reduces their nicotine intake. Since smoking cigarettes is the most popular form of nicotine use, the effects of nicotine withdrawal has been most commonly observed in people who are in the process of quitting smoking. This can lead to the person becoming irritable; craving cigarettes and suffering from intense headaches. Persons who have smoked a higher number of cigarettes or for a longer period are more likely to experience these symptoms, although almost all people who try to ‘kick the habit’ suffer some form of withdrawal symptoms from the drug.