Smoking three cigarettes a day is harmful.
The composition of cigarettes is mainly nicotine, and its harm is mainly the following:
1. Smoking is prone to various heart diseases: nicotine is prone to accelerated heart rate, insufficient blood supply capacity of the heart muscle, further triggering coronary artery stenosis and various heart diseases.
2. Smoking lowers the immunity of the lungs, which can easily lead to lung infections and further cause lung cancer.
3. Smoking will lead to insufficient oxygen supply to the brain, which will further lead to cerebral hemorrhage, stroke and other brain diseases.
4. Smoking may also cause osteoporosis, pregnant women smoking will lead to premature birth of the fetus, men smoking may have an impact on fertility.
The harm caused by long-term excessive smoking is incalculable, and it is recommended to quit smoking in time to maintain good health.