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Nicotine (chemical name: nicotine) is the core component of tobacco. It stimulates the brain to release dopamine, creates a short-term sense of pleasure, and thus forms a strong addiction. However, its harm is far more than that:

1. Cardiovascular system: accelerates heart rate, constricts blood vessels, and increases the risk of heart disease and stroke.
2. Respiratory system: damages the lung mucosa, induces chronic obstructive pulmonary disease (COPD) and lung cancer.
3. Nervous system: long-term exposure may cause anxiety, depression, and even lead to cognitive decline.
4. Adolescent risk: adolescent brains are immature and more sensitive to nicotine, and the risk of addiction is three times that of adults.

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<p>Nicotine is a major active ingredient present in tobacco (chemical component nicotine butyrate) and is one of the key factors leading to smoking addiction. The following are the health effects of nicotine and its related harmful substances:</p>
<p>1. Nicotine<br>Function: Nicotine stimulates nicotine receptors on the oral mucosa, causing smokers to experience pleasure and gradually develop dependence.<br>harm:<br>Oral health: Long term exposure to nicotine can lead to oral diseases such as ulcers and gum bleeding.<br>Nervous system: Nicotine can affect the development and function of the central nervous system, leading to the formation of addictive thinking patterns.<br>Cardiovascular system: Overuse of nicotine may lead to discomfort symptoms such as increased heart rate and elevated blood pressure.<br>2.