Why people smoke
Tobacco is a silence kill. Smoking is a major contributing factor in lung cancer. Smokers with high-level NNAL is twice more likely to have lung cancer than nonsmokers. And the health risks of tobacco smoking are well known with regard to diseases of the heart, lungs, and blood vessels. The average life expectancy of smokers is fewer 4.6 years than non-smokers. Smoking has so much harm. But why we meet smokers everywhere. It is reported that China currently has about 3.5 million smokers. Over the years, Chinese tobacco has been keeping seven "world first "：the first number of tobacco acreage，the first amount of acquired tobacco，the first number of cigarette production，the first amount of smokers，the maximum tax profit through the sale of tobacco，the first number of people die of smoking related diseases. Smoking endangers health, why does that person smoke even? Addicted to Nicotine
For smokers, smoking is not just a habit. It is also a performance of difficult to refuse nicotine addiction. We now understand that it's this substance that keeps people smoking, despite all the warnings. Nicotine is a kind of alkaloids exists in the Solanaceae plants，and an important component of tobacco. Nicotine is an addictive drug. Because addiction to nicotine is as strong as an addiction to heroin, abstinence is difficult. When smokers smoke, smog carries the nicotine into the body. 90% of the nicotine is absorbed by the lungs, 1 / 4 of which is absorbed into the brain within a few seconds. Nicotine is combining with the receptors to produce dopamine. Dopamine can make people feel cheerful. However, nicotine is very easy to be out of the body. With the reduction of nicotine in the body, the secretion of dopamine levels decreased rapidly. Smokers may feel irritable, malaise, nausea, and headache and have a desire to add nicotine. Once nicotine replacement, the dopamine is immediately dumped. So smokers feel good again. They formed a "reward circuit”...
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