When you smoke a cigarette, inhale nicotine vapor, or use a nicotine patch or gum, nicotine is absorbed into your bloodstream through your lungs, mouth, or skin.
2. Nicotine travels to the brain.
Once in your bloodstream, nicotine travels to the brain, where it crosses the blood-brain barrier and enters the central nervous system.
3. Nicotine binds to receptors in the brain.
Nicotine binds to receptors in the brain called nicotinic acetylcholine receptors (nAChRs). These receptors are found on nerve cells in the brain and spinal cord.
4. Nicotine triggers the release of neurotransmitters.
When nicotine binds to nAChRs, it triggers the release of neurotransmitters, including dopamine, serotonin, and norepinephrine. These neurotransmitters produce the effects of nicotine, including:
* Stimulation: Nicotine increases alertness, energy, and concentration.
* Relaxation: Nicotine also produces a calming effect, which is why many people smoke to relieve stress.
* Pleasure: Nicotine releases dopamine, which is associated with feelings of pleasure and reward. This is why many people find smoking addictive.
5. Nicotine leaves the body.
Nicotine is metabolized in the liver and kidneys and then excreted in the urine. The half-life of nicotine is about 2 hours, which means that it takes about 2 hours for half of the nicotine in your body to be eliminated.
The effects of nicotine
Nicotine has a number of short-term and long-term effects on the body.
Short-term effects
The short-term effects of nicotine include:
* Increased heart rate: Nicotine causes the heart rate to increase by 10-20 beats per minute.
* Increased blood pressure: Nicotine raises blood pressure by about 5-10 mmHg.
* Constriction of blood vessels: Nicotine narrows blood vessels, which can reduce blood flow to the heart, brain, and other organs.
* Increased respiration: Nicotine speeds up breathing by about 10-15 breaths per minute.
* Dry mouth: Nicotine reduces the production of saliva, which can lead to dry mouth.
* Nausea: Nicotine can cause nausea, especially in people who are not used to smoking.
* Headache: Nicotine can cause headaches, especially in people who smoke heavily.
Long-term effects
The long-term effects of nicotine include:
* Increased risk of heart disease: Nicotine increases the risk of heart disease, stroke, and peripheral artery disease.
* Increased risk of cancer: Nicotine increases the risk of lung cancer, mouth cancer, throat cancer, and esophageal cancer.
* Increased risk of respiratory problems: Nicotine damages the lungs and increases the risk of chronic bronchitis, emphysema, and pneumonia.
* Increased risk of gum disease: Nicotine damages the gums and increases the risk of gum disease and tooth loss.
* Increased risk of cataracts: Nicotine increases the risk of cataracts, a clouding of the lens of the eye.
* Increased risk of erectile dysfunction: Nicotine damages blood vessels and can lead to erectile dysfunction.
* Increased risk of addiction: Nicotine is highly addictive, and about 32% of people who smoke cigarettes become addicted.
Conclusion
Nicotine is a highly addictive drug that has a number of short-term and long-term effects on the body. If you are thinking about starting to smoke or if you are a current smoker, it is important to be aware of the risks involved.
