Brain injury and smoking will reduce the oxygen content in the blood of the brain, hinder the blood circulation of the brain to a certain extent, cause cerebral vascular bleeding and occlusion, and then lead to paralysis, stroke and other diseases. Usually, smokers are twice as likely to have a stroke as nonsmokers.

Oral injury, smoking can lead to oral cancer and laryngeal cancer. Smoking easily inflames salivary glands, damages taste buds and greatly weakens the ability of taste and smell. Harmful substances in tobacco can easily corrode gums and periodontal tissues, and easily cause periodontitis, tooth loosening, tooth loss, bad breath and so on.

Lung injury and smoking are one of the main causes of chronic obstructive pulmonary disease. Smoking can cause changes in the structure and function of central and peripheral airways, alveoli and capillaries, and at the same time affect the immune system of the lungs, thus leading to lung diseases.