Your body gets more than nicotine when you smoke a cigarette.
There are more than 4,000 chemicals in cigarette smoke. Some of them are also in wood varnish, the insect poison DDT, arsenic, nail polish remover, and rat poison.
The ashes, tar, gases, and other toxins in cigarettes harm your body over time. They damage your heart and lungs. They also make it harder for you to taste and smell things and fight infections.
After 48 hours: Your ability to taste and smell starts to return.
After 72 hours: The bronchial tubes (airways) relax.
After two weeks to three months: Your circulation improves.
After one to nine months: Cilia (tiny hairs) in the lungs regrow, increasing the lung's capacity to handle mucus, clean itself, and reduce infection. Coughing, sinus congestion, fatigue, and shortness of breath also decrease.
After one to five years: Your risk of dying from heart disease is cut to half that of a lifelong smoker's risk.
After 10 years: Your risk of dying from lung cancer drops to almost the same rate as that of a lifelong nonsmoker. Your risk for mouth, larynx, and other cancers decreases.