Nicotine is a powerful drug that acts directly upon receptors in your brain. These receptors are stimulated by nicotine, resulting in several different physiological responses such as elevated heart rate, blood pressure and respiration, and increased mental alertness, among others. The longer you ingest nicotine, the more of these receptors you develop. Over time, these receptors become less sensitive to nicotine and begin to require increased doses to achieve the same level of stimulation. When you try to stop smoking nicotine, feelings of intense discomfort (known as withdrawal) will occur.
People have described nicotine withdrawal symptoms as "demons" or "torture" because they are so strong. Most people report feelings of intense restlessness, irritability, fatigue, dizziness, and even flu-like symptoms or chest pain.
Physical withdrawal symptoms can often be eased with the use of nicotine replacement products like gum, patches and lozenges, but many people feel that these products only delay the inevitable by keeping the ex-smoker hooked on nicotine. Still other people claim that using nicotine replacement products helped them conquer one aspect of quitting at a time - for example, the psychological or emotional repercussions, before tackling the physical addiction.
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