1, the cut tobacco of cigarettes can stop bleeding and relieve pain.
2, deodorization, cut tobacco and cigarettes have the function of deodorization.
Smoking can secrete dopamine, make people feel happy and relieve stress and anxiety.
Second, the shortcomings:
1. For women of childbearing age, smoking can lead to menstrual disorder, difficulty in conception, ectopic pregnancy, low estrogen, osteoporosis, early menopause and early menopause.
2. Cigarette smoke (especially the tar contained in it) is a carcinogen-that is, it can produce cancer in the tissues it comes into contact with.
Nicotine in cigarettes will harden arteries, which will lead to cardiovascular diseases.
4, smoking will make the lungs cancerous, and it is easy to get bronchitis.
Extended data:
Effect of tobacco on brain: Nicotine spreads to the whole body through lung mucosa and oral mucosa. After nicotine enters the brain, it can imitate the central neurotransmitter acetylcholine and combine with nicotine receptors on the surface of many neurons. Nicotine can stimulate the central nervous system, especially in the reward circuit.
It can release more dopamine by activating related nerves. The harmine and norepinephrine contained in tobacco can keep dopamine, serotonin and norepinephrine in synapses at a high level by inhibiting the activity of catabolic enzymes. With the strengthening of dopamine, serotonin and norepinephrine, people will be more awake and more focused, thus alleviating anxiety and enduring hunger. Tobacco can cause nausea, dizziness and headache.
Tolerance and dependence: Regular smoking can keep the nicotine content in the brain at a high level. Neuron receptors are less and less sensitive to nicotine, and their stimulating effect on dopamine release is also weakened. The original cigarette consumption can no longer satisfy the pleasure of smokers, and smokers are tolerant of nicotine.
When smokers stop smoking for a few hours (sleep time), the nicotine content in the body will drop and the neuron receptors will become extremely sensitive. At this time, the activity of acetylcholine exceeds the normal level, which makes smokers become irritable and want to smoke very much. At this time, if you can smoke a cigarette, you can over-stimulate neuronal receptors and promote the release of dopamine in large quantities. Through this phenomenon, we can understand why the first cigarette every day can bring great pleasure to "old smokers", and smokers are therefore caught in a vicious circle of more and more addiction.
References:
Baidu encyclopedia: cigarettes