Smoking for 40 years suddenly quit smoking is good, quit smoking can reduce the likelihood of a variety of diseases, beneficial to health.
Tobacco contains nicotine and tar and many other harmful substances, long-term smoking will increase the risk of respiratory diseases such as chronic bronchitis, obstructive pulmonary disease, but also induced coronary heart disease, hypertension and other cardiovascular diseases. In addition, nicotine and tar also have certain carcinogenic effects, which will increase the risk of cancer.
Quitting smoking is the only proven way to reduce the harms of smoking, and smokers who quit can experience significant health benefits, including increased longevity, reduced risk of developing and dying from smoking-related diseases, and improved prognosis for many smoking-related diseases. Quitting smoking slows the decline in lung function and reduces the frequency of acute exacerbations of chronic obstructive pulmonary disease. Quitters have a longer survival time compared to continuous smokers.
Smoking is harmful to health and early cessation is recommended.