Are these common questions about smoking correct?

       Are the popular science questions about smoking in China correct?

　　Some smokers feel very healthy, so they feel no need to quit smoking.

　　In fact, the harm of smoking is the result of long-term effects, rather than an immediate manifestation.

　　Many coronary heart disease and lung cancer are caused by smoking for more than 10 years. The current health does not mean that smoking has no impact on health.

　　Is low tar cigarettes really less harmful?

　　Of course not. The fact is that it does not reduce, but increases health risks.

　　In order to safeguard its commercial and economic interests and deal with the public's fear of tobacco health, tobacco companies put forward the slogan of "reducing coke and harm", claiming that "low tar=low harm", which is a trap to deceive the public.

　　The amount of tar we saw on the cigarette box was tested by the machine, but it was inconsistent with the amount of tar inhaled. In one study, the company admitted that smokers actually consumed three times the amount of tar measured by the machine.

　　The decrease of tar does not mean that some strong carcinogens in tar have not decreased, such as nitrosamines, polycyclic aromatic hydrocarbons, etc.

　　In addition, low tar cigarettes can produce compensatory smoking.

　　After the tar drops, in order to maintain the concentration of nicotine in the blood, smokers will take the "compensation behavior", and smoke deeper and more.

　　With the increase of smoking frequency and quantity, its harmful substances in the inhaled tobacco will also increase.

　　——"Smoking helps to focus on learning"

　　Many people believe that smoking helps to focus and lighting cigarettes helps them think. This myth is the reason why many smokers stop smoking.

　　In fact, when you focus on writing, thinking and other aspects, smoking does not help you, but is counterproductive, because nicotine withdrawal symptoms will suddenly appear after the smoke goes out, forcing you to divert your attention and then light a cigarette.

　　On the other hand, smoking will also reduce the ability of blood to carry oxygen, resulting in insufficient oxygen supply to the brain. Smoking will reduce brain blood flow, which may reduce intelligence, thus further affecting the ability of smokers to focus on thinking.

　　——"A cigarette after dinner is better than a living immortal"

　　Many smokers like to light a cigarette after dinner.

　　It's time to relax after dinner, without work pressure and hunger, but smokers can't do it wholeheartedly after dinner

　　When relaxing, there should be another kind of "hunger" to meet. He thought that "a cigarette after dinner is better than a living immortal", but did not know that his inability to relax was the reason for smoking.

　　Research shows that smoking immediately after meals is harmful to human health.

　　After eating, the digestive system will enter the state of digestion and absorption. The gastrointestinal peristalsis is frequent, the blood circulation speed is accelerated, the pores of the whole body will open, releasing some excess heat, and accelerating the biological respiration of tissues and cells.

　　If you smoke at this time, the harmful substances represented by nicotine in the smoke will be absorbed by the lungs and tissues of the whole body, causing more harm to human physiological functions and tissues than we usually smoke.

　　Smoking after meals can also cause excessive bile secretion, inhibit the secretion of trypsin and carbonate, and affect the digestion and absorption of food.

　　It can be seen that smoking after meals is harmful to the body without any benefit.

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