Why is cigarette-smoking harmful?

Cigarette smoking is harmful to both the smoker and those exposed to secondhand smoke. Below are a few key points highlighting the harmful effects of cigarette smoking :

1. It increases the risk of cancer due to the many toxic carcinogens present in the cigarette smoke.
2. It damages the respiratory system causing respiratory diseases like pneumonia, asthma, chronic bronchitis, etc.
3. It significantly increases the risk of heart diseases and stroke.
4. It affects almost every organ in the body. It weakens the immune system, damages the skin, teeth, and gums, and increases the risk of vision problems.