Health hazards of smoking
The effect of tobacco on the brain: Nicotine diffuses through the lung mucosa and oral mucosa to the whole body. After entering the brain, nicotine can mimic the effect of acetylcholine, a central neurotransmitter, and combine with nicotine receptors on the surface of many neurons. Nicotine has a stimulating effect on the central nervous system, especially in the "reward circuit". It releases more dopamine by activating the associated nerves. The halmin and norhalmin contained in tobacco can keep the dopamine, serotonin and norepinephrine in the synapse at a high level by inhibiting the activity of decomposing enzymes. As dopamine, serotonin, and norepinephrine are maintained, people are more awake, more focused, and more able to relieve anxiety and hunger. Tobacco can cause nausea, dizziness, and headaches. Tolerance and Dependence: Regular smoking keeps nicotine levels in the brain at consistently high levels. The neuron receptors are becoming less and less sensitive to nicotine, and the stimulating effect on the release of dopamine is also weakened. When a smoker stops smoking for a few hours (sleep time), the nicotine content in the body decreases, and the neuron receptors become abnormally sensitive. At this time, the activity of acetylcholine exceeds the normal level, making the smoker become irritable and want to smoke. At this time, if you can smoke a cigarette, you can over-stimulate the neuron receptors and cause a large release of dopamine. Through this phenomenon, we can understand why the first cigarette of the day can bring great pleasure to the "old smoker", and the smoker is thus caught in a vicious circle of increased smoking addiction. The first ambassador to use tobacco as a medicine - In 1560, when tobacco was not yet popular, Jean Nico, the French ambassador to Portugal, sent it home as a medicine for many diseases. Hundreds of years later, chemists have finally revealed that the misused curative drug in tobacco is a harmful substance and named it nicotine.
← Older Post Newer Post →