Hello, there are many hazards of smoking, mainly because it is rich in harmful substances such as nicotine and tar. Long-term smoking may induce pneumonia, bronchitis, chronic obstructive pulmonary disease and other diseases. It may also induce cardiovascular and cerebrovascular diseases and malignant tumors. Hello, there are many hazards of smoking, mainly because it is rich in harmful substances such as nicotine and tar. Long-term smoking may induce pneumonia, bronchitis, chronic obstructive pulmonary disease and other diseases. It may also induce cardiovascular and cerebrovascular diseases and malignant tumors. Hello, there are many hazards of smoking, mainly because it is rich in harmful substances such as nicotine and tar. Long-term smoking may induce pneumonia, bronchitis, chronic obstructive pulmonary disease and other diseases. It may also induce cardiovascular and cerebrovascular diseases and malignant tumors. Hello, there are many hazards of smoking, mainly because it is rich in harmful substances such as nicotine and tar. Long-term smoking may induce pneumonia, bronchitis, chronic obstructive pulmonary disease and other diseases. It may also induce cardiovascular and cerebrovascular diseases and malignant tumors. Hello, there are many hazards of smoking, mainly because it is rich in harmful substances such as nicotine and tar. Long-term smoking may induce pneumonia, bronchitis, chronic obstructive pulmonary disease and other diseases. It may also induce cardiovascular and cerebrovascular diseases and malignant tumors.