Nicotine is an organic compound present naturally in the tobacco plant.
It is found in every part of the plant and especially in the leaves.
The term "nicotine" comes from the physician Jean Nicot.
Nicotine is a substance identified as a drug and for this reason it is addictive and stopping its use causes withdrawal symptoms.
It greatly accelerates the heart rate and forces the heart to work faster.
Nicotine causes addiction and the need to gradually increase the dosage to maintain the same stimulating effect.
The addiction to smoking is both a psychological and physiological.
The impulse to smoke is very intense in the first two days and gradually fades after about two weeks.
Detoxification from nicotine requires a lot of commitment.
The substance is absorbed through the lungs and enters the bloodstream.
In about 10 seconds nicotine affects the brain.
Once it reaches the cerebral circulation, it acts directly on the neurons that are responsible for the reward mechanisms.
It causes the release of dopamine and activates the brain functions related to attention, mood and concentration.
How to stop smoking:

• Avoid going to places, where you know that people will be smoking and avoid paying attention to those who smoke.
  
• Spend more time in places where smoking is prohibited (theaters, cinemas, museums).
  Wash your clothes to get rid of the smell of smoke, which may trigger the desire for a cigarette.
  
• Buy a small pack of cigarettes that contains ten cigarettes.
  
• Only smoke half the cigarette and choose cigarettes with low nicotine and tar.
  
• Use an ashtray and wash it every time you smoke.
  
• Hide the pack of cigarettes, so that you won't be able to see it or even better don't keep packs of cigarettes in your house.
  
• Brush your teeth frequently to prevent the formation of spots on the teeth due to cigarette smoke and to get rid of the taste of cigarettes from your mouth.
  
• Wash your hands thoroughly and moisturize the skin to reduce the damage on the skin and nails and the formation of wrinkles.
  
• Avoid any food or substance that you have associated with smoking, for example coffee.
  

Common withdrawal symptoms after you quit smoking: The withdrawal symptoms can vary.
Being nervous, having a dry mouth and feeling hungry are common symptoms caused by the abstinence from tobacco smoke.
Other common symptoms include: sweating, headaches, tingling in the hands and feet, intestinal disorders (like cramps and nausea), sore throat, coughing, insomnia, irritability, anxiety, mental confusion, vagueness and depression.
Irritability and craving can sometimes reach a nearly intolerable point.
For this reason, it would be a good idea to use a homeopathic remedy that can help you relieve the symptoms.