Quitting smoking at the age of 70 will not cause harm to the lungs.
There is a direct relationship between lung diseases and smoking. There are many harmful substances in tobacco, which have a great impact on the lungs and can easily lead to emphysema, bronchodilatation, chronic obstructive pulmonary disease (COPD), pulmonary blisters, and other diseases, resulting in diminished lung function.
Smoking cessation can also reduce the morbidity and mortality of stroke, vascular diseases and pneumonia, etc. Smoking cessation is an important means of preventing and treating COPD, and it is the only way proven to be effective in slowing down the progressive decline in lung function.
Quitting smoking at age 70 does not cause additional lung damage and prevents the harmful substances in tobacco from further damaging the lungs. However, if you already have lung damage, it is usually impossible to return to normal.
If you need to quit smoking, you can go to a smoking cessation clinic in a regular hospital to get professional guidance on quitting.